Reddy On Rails more than Ruby

Kaminari plugin with column_sorting and jquery_ajax

2011-05-25T10:16:00.000-07:00

https://github.com/reddyonrails/Kaminari_column_sorting_jquery_ajax

The above example code for column sorting through ajax calls when doing pagination.

Better to use sorting image arrows for column heading for visual appealing

Please visit for original kaminari pagination plugin here.
https://github.com/amatsuda/kaminari

For those using MacPorts, ImageMagick 6.6.5 and Ruby 1.9.2.

2011-04-28T13:56:00.000-07:00

If anybody get this error :
/gems/carrierwave-0.5.3/lib/carrierwave/processing/rmagick.rb:248: [BUG] Segmentation fault
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.7.0]

Theses are the steps to avoid it (Port).
port uninstall ImageMagick
port edit ImageMagick
Add --disable-openmp to configure.args (near line 100)
port install ImageMagick

Uninstall imagemagick:

brew remove imagemagick

Delete the cache:

rm -rf 'brew --cache imagemagick'

Then re-install the package with this flag:

brew install -f imagemagick --disable-openmp

how to stop Rspec run on first failure :rspec tip

2011-02-14T15:27:00.000-08:00

Edit "spec/spec_helper.rb" with:
```
RSpec.configure {|config| config.fail_fast = true}
```
```
 
```
Set the fail_fast option to tell RSpec to stop the run on first failure.
```
 
```

Restful routes for non ID( primary key ) rails 3

2011-01-31T14:40:00.000-08:00

Lets suppose that you have a Profile model, and you have a resources :profiles route.

Generally, profile_path will build a path with the profile object’s ‘id’ in it:

profile = profile.find_by_name('jaganreddy')
  profile_path(profile)  # => "/profiles/1"

You can override to_param in your model to make profile_path build a path using the profile’s name instead of the profile’s id:

class Profile < ActiveRecord::Base

    def to_param # overridding default behaviour

       name

end

 end
    
  

  profile = Profile.find_by_name('jaganreddy')
  profile_path(profile)  # => "/profiles/jaganreddy"

Also take care for nested resources too

In your controller always looks for  
Profile.find_by_name(params[:id])

how to set primary key and autoincrement on non id column using rails 3 -- sqlite

2011-01-26T13:53:00.000-08:00

sqlite_adopter uses
       def default_primary_key_type
          if supports_autoincrement?
            'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'
          else
            'INTEGER PRIMARY KEY NOT NULL'
          end
        end
and under the create table definition the line says:
table_definition.primary_key(options[:primary_key] || Base.get_primary_key(table_name.to_s.singularize)) unless options[:id] == false

that means we should not set :id => false ... many people will do to avoid id column.. this is fine
but if you want other column as primary key add at table definition not at column definition.(dont add :id => false)..

adding primary_key at table definition will take care of removing id column. the following line will also add t ocolumn definition
'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'
ofcourse based on sqlite3 version...

      def supports_autoincrement? #:nodoc:
        sqlite_version >= '3.1.0'
      end
Note: so autoincrement for :primary_key is hard coded
sample:
create_table :students, :primary_key => student_id do |t|
   t.string :name
end
it generates students table as follows;
students;

student_id : primary key autoincrement

name : varchar

This is for what i am using version of rails : 3.0.3

undefined method `user_signed_in? with Rails 3.0.3 - Devise

2011-01-10T12:04:00.000-08:00

I just started a new rails 3.0.3 application after doing a gem update
(loaded rails 3.0.3 and devise 1.1.5) and I got the same error. This
was following the default devise install instructions.

answer:
for got to add
devise_for :users in routes.rb

Date sort in ruby from array can have date formats ,non date formats

2010-11-05T14:09:00.000-07:00

Date sorting(ruby) from array is easy if array contain strings with proper date formats. Sometime invalid date formats raise argument error.

Sample i have used for date column attribute as follows.
def sort_on_mature_date(listings)
    listings.sort do |x,y|
      x_matures_on = x.when_does_it_mature? #date type
      y_matures_on = y.when_does_it_mature? #date type
      begin Date.parse(x_matures_on)   rescue x_matures_on="1900-1-1" end    #string could be not a date like "now"
      begin Date.parse(y_matures_on) rescue y_matures_on="1900-1-1" end
      Date.parse(x_matures_on)<=>Date.parse(y_matures_on)
    end
end

Rails rounded corner box helper

2010-10-22T11:18:00.000-07:00

Here is the helper include in your rails app. You need to take care of images .
#usage:

<%top = {"background-image"=>"url('/images/accept_box_top.png')",:height=>"6px",:width=>"328px"}%>

<%mid = {"background-image"=>"url('/images/accept_box_mid.png')",:height=>"405px",:width=>"auto"}%>

<%bottom = {"background-image"=>"url('/images/accept_box_bottom.png')",:height=>"9px",:width=>"auto"}%>

<%content = {"padding"=>"15px 28px 22px 26px"}%>
<%=round_box(top,mid,bottom,content){|f| "nice box"} %>

Make sure that you pass right height and width. It automatically renders the box and content inside.
If you want you also add extra css attributes too!

#round_box_helper.rb

module RoundBoxHelper

def round_box(top, mid,bottom,content,&b)

     css_elements( top,mid,bottom,content)+

     "<div class = 'accept_gift_box'>

      <div class='accept_gift_box_top'></div>

        <div class='accept_gift_box_mid'>

          <div
class='accept_gift_box_content'>


"+b.call+"

          </div>

        </div>

    <div class='accept_gift_box_bottom'> </div>

</div>"

end

def css_elements top,mid,bottom,content

     "<style type='text/css'> " +

      ".accept_gift_box_top{"+

        parse_styles( top )+

      "}"+

       ".accept_gift_box_mid{"+

        parse_styles( mid )+

      "}"+

      ".accept_gift_box_bottom{"+

        parse_styles( bottom )+

      "}"+

      ".accept_gift_box_content{"+

        parse_styles( content )+

      "}"+

      ".accept_gift_box{"+

       "float:left;"+

      "}"+

     "</style>"

end

def parse_styles el

    str=""

    el.each_pair do |attr,value|

      str = str+attr.to_s+":"+value.to_s+";"

    end

    str

end

end

width and top of invisible element in IE may give 0 zero using jQuery

2010-09-28T09:45:00.000-07:00

jQuery element width for invisible element in IE will not give exact result.
But in Firefox it works perfectly.

$(e).width() //using jQuery to get the width.

i have used a way to solve this one by showing, calculate width and hiding the element.

$(e).
show(). // to get the width of visible element ==> IE issue
css({zoom: 1,left:$(e).position().left-parseInt($(e).width()),top:$(e).position().top}).
hide().

jQuery animation effect slide bug in IE 7

2010-09-28T09:34:00.000-07:00

The best example is for this ind of bug is presented by ryan as follows

http://www.ryancramer.com/misc/jquery_slide/#

the slide effects of jquery may not work 100% correctly in IE 6 & IE 7 . Effects are misbehave like effects complete till 50% or so...

So i have used show call back function to rescue the bug.. Though it is 100% not correct but once the effects renders second time it works perfectly.

So make it show and show it again..with less duration.. to avoid flickering effect.

$("my_element").show(1,function(){$(this).show("slide",{direction:"right"})})

authenticity_token not available in Rails 2.X version for non forms

2009-07-08T09:24:00.000-07:00

This problem occur if view is not having any form ...
When a form is being generated rails automatically adds something like
this:

< input name="authenticity_token" type="hidden" value="11ff3908e6cd4be7b4041a93b783829ce6b12349" >  
If view does not contain form ("authenticity_token")  InvalidAuthenticityToken is being raised.

So You can do something like this in your view to make your authenticity 
token available to your javascript in your views.

<%= javascript_tag "window._token = '#{form_authenticity_token}'" %>

That will make your authenticity token available to your custom 
javascript Ajax requests.  If you're using prototype.js and you want to 
do a custom PUT, you do something like this.

  new Ajax.Request ('/products/1', {
    method: 'put',
    parameters: 'product[name]=chair&authenticity_token=' + 
window._token});

If you use Jquery :=

$.ajax({
              url: "people/1,
              global: false,
              type: "PUT",
              data: ({'person[name]' : 'hey',authenticity_token : window._token}),
              dataType: "html",
              success: function(msg){
                 //ur msg;
              }});

MS Word processing or parsing using ruby and Apache POI

2009-06-11T14:53:00.000-07:00

I am looking for MS word document processing to get text information using ruby. But could not find right gems in ruby. Some win32 ole libraries are there but will not work in linux. So thought about using Poi java api to process word document.

I hv downloded poi jar files from here.
http://www.apache.org/dyn/closer.cgi/poi/release/

changed the name of the directory to poi folder .

Check the following ruby script to get the parsed text .. it uses java interface code in WordSampleReader.java   this file should be compiled and should be available under poi folder where all jar files are there.

CONFIG = {}
class WordReader
#include Config
CONFIG['host'] = 'mswin32'
def self.generate_text(filename)

    interface_classpath=Dir.getwd+"/poi"

    case CONFIG['host']
      when /mswin32/
        Dir.foreach("poi") do |file|
          interface_classpath << ";#{Dir.getwd}/poi/"+file if (file != '.' and file != '..' and file.match(/.jar/))
        end
        path = "java -cp \"#{interface_classpath}\" WordSampleReader "+filename
      else
        Dir.foreach(Dir.getwd+"/poi/") do |file|
          interface_classpath << ":#{Dir.getwd}/poi/"+file if (file != '.' and file != '..' and file.match(/.jar/))
        end
        path = "java -cp \"#{interface_classpath}\" WordSampleReader "+filename
      end
    result = ""
    IO.popen(path, "w+b" ) { |x| result= x.read }
    result
end
end

puts reader = WordReader.generate_text('poi/test.doc')

Though i dont know java used sample code found in google.. The file called WordSampleReader.java.

The source code file is ...

//package com.informit.poi;

// Import POI classes
import org.apache.poi.poifs.filesystem.*;
import org.apache.poi.hwpf.*;
import org.apache.poi.hwpf.extractor.*;

// Import Java classes
import java.io.*;
import java.util.*;

public class WordSampleReader
{
public static void main( String[] args )
{
   if( args.length == 0 )
   {
     System.out.println( "Usage: WordSampleReader " );
     System.exit( 0 );
   }

   String filename = args[ 0 ];
   try
   {
     // Create a POI File System object; this is the main class for the POIFS file system
     // and it manages the entire lifecycle of the file system
     POIFSFileSystem fs = new POIFSFileSystem( new FileInputStream( filename ) );

     // Create a document for this file
     HWPFDocument doc = new HWPFDocument( fs );

     // Create a WordExtractor to read the text of the word document
     WordExtractor we = new WordExtractor( doc );

     // Extract all paragraphs in the document as strings
     String[] paragraphs = we.getParagraphText();

     // Output the document
     //System.out.println( "Word Document has " + paragraphs.length + " paragraphs" );
    // for( int i=0; i
     //{
      //System.out.println( paragraphs[ i ] );
     //}
    // output text
      System.out.println( we.getText() );

   }
   catch( Exception e )
   {
     e.printStackTrace();
   }
}
}

QuickBase autheticate ruby method bug in quickbase client library

2009-05-11T11:37:00.000-07:00

For subsequent calls with the help of ruby quickbase api , it should consider the old token number.

Existing method :

def authenticate( username, password, hours = nil )

      @username, @password, @hours = username, password, hours

      if username and password

         @ticket = nil
         xmlRequestData = toXML( :hours, @hours ) if @hours
         sendRequest( :authenticate )
         @userid = getResponseValue( :userid )
         return self if @chainAPIcalls
         return @ticket, @userid

      elsif username or password
         raise "authenticate: missing username or password"
      elsif @ticket
         raise "authenticate: #{username} is already authenticated"
      end
   end

The above one missing token variable and which is very important for next or immediate calls.
so add this line in the above method.
@ticket = getResponseValue( :ticket )

Import Gmail Contacts - Ruby on Rails

2009-04-11T22:49:00.000-07:00

Tried with my own ruby script to get contact information from google but requires some more extra work to make request in secure way.

First, you need to register your domain with Google. This can be as easy as uploading a temporary file to your domain’s root directory to verify control of the domain. The steps for doing this are clearly outlined at Registration for Web-Based Applications.

I find good article to import google contact information. Use the same code but check the code for error free.. you should have same patience to make it work :-)

http://blog.guitarati.com/2008/08/google-accounts-authentication-using.html

nil? problem on object methods in ruby use Object#try

2008-12-17T10:52:00.000-08:00

Object#try is a solution that I like. However, it uses Object#respond_to?
Ruby Community uses this solution recently in github.
class Object
##
# @person ? @person.name : nil
# vs
# @person.try(:name)
def try(method)
send method if respond_to? method
end
end

But it does not solve the problem of args and blocks.
The right solution for generic try method is :
#By Jagan Reddy

class Object

def try(method, *args, &block)

send(method, *args, &block) if respond_to?(method, true)

end
end

difference between lambda and Proc.new (Closures)

2008-12-17T10:46:00.000-08:00

The #lambda is not the same as Proc#new. It’s ok to say the same, but not exactly.
1: First Difference
$ irb irb(main):001:0>
Proc.new{|x,y| }.call 1,2,3 =>
nil

irb(main):002:0>
lambda {|x,y| }.call 1,2,3
ArgumentError: wrong number of arguments (3 for 2) from (irb):2 from (irb):2:in `call' from (irb):2 from :0
irb(main):003:0>

2: Second Difference
def test_ret_procnew
ret = Proc.new { return 'Returned' }
ret.call “This is not reached”
end
# prints 'Returned'
puts test_ret_procnew

While return from lambda acts more conventionally, returning to its caller:

def test_ret_lambda
ret = lambda { return “Returned” }
ret.call “This is printed”
end
# prints “This is printed”
puts test_ret_lambda

Sass & Haml AutoCompile option

2008-12-12T09:52:00.000-08:00

If you are using Sass & Haml, then you may wanted to compile files for each request =>

Just add the following small chunk of code to your development.rb file.


Sass::Plugin.options[:always_update] = true

Ruby language features

2008-12-10T15:04:00.000-08:00

When started learning ruby in 2004, api helped me to understand the features.
Though I used most of rugular expressions and classes, rails gave me enough experience to make use of
many ruby unique features like jayson expalined in the following article.

http://www.rubytips.org/2008/04/07/10-unique-ruby-language-features/

Also look athe Features of Ruby by Michael Neumann

http://www.ntecs.de/old-hp/s-direktnet/ruby_en.html

Ruby on Rails Rake Tutorial

2008-12-05T07:56:00.000-08:00

In Rails developement, we will be using running "rake" to run your tests or maybe you've used "rake db:migrate" to run your migrations. Many of us know about Make scripts. What if you want to run ruby scrupts inside make then we need rake for that. Did you realize that you can write your own tasks or create your own library of useful Rake files?

Greg of rails envy gave nice article on Rails Rake ..:-)

http://www.railsenvy.com/2007/6/11/ruby-on-rails-rake-tutorial

APTANA ,RDT and RadRails Keyboard Shortcuts

2008-11-07T11:00:00.000-08:00

RDT together with RadRails on Eclipse is a pretty convenient development environment when doing things in Ruby on Rails. The keyboard shortcuts.

Ctrl-Alt-T

Jump to the test case of a model or controller and vice versa.

Ctrl-Shift-V

Jump to the view of a controller method and vice versa.

Ctrl-Alt-X

Factor out a partial from a view. Simply select the code block you want to factor out into a separate partial an press the key combination. A window opens an you can enter the name for the new partial (dont't forget the _ and the .rhtml).

Ctrl-Shift-F

Auto-format the selected code (Ruby only). Not that mature, yet, and seems to have problems with regular expression - currently not recommended to use.

Ctrl-Shift-C

Toggle comment (Ruby only), i.e. the selected code block will be commented out if it wasn't (# are inserted in the first column of each row), and vice versa.

You can also keep up with general Aptana updates as well as RDT and RadRails specific news on the Aptana blog.

Aptana RadRails Debugger Problem

2008-11-07T10:54:00.000-08:00

I've found the debugger equally slow when launching it via the "servers" tab.

There is a new "remote debug" capability in the trunk version of RadRails. Instead of launching a server from within RadRails, you can start your server externally (on the same or a different computer) under the control of debug-ide and then attach to it from a debug session in RadRails.

I've been using this capability, and found that it also solves the "slow debugger startup" problem.

Not sure why, and I wouldn't have expected it, but it's what I've observed.

Ruby on Rails applications with Mongrel cluster and Apache url rewriting on Windows

2008-10-10T13:48:00.000-07:00

For windows, we need install mongrel_service gem to run mongrel clusters...

What you will need to do is to manually create n mongrel services for the n clusters you will need.

Visit this link . you will find windows mongrel configuration as well as ubuntu tooo

Nice article and simple tooo

Ruby on Rails applications with Mongrel cluster and Apache url rewriting on Windows

mongrel not running on windows

2008-10-10T13:43:00.000-07:00

C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- C:/ruby/lib/ruby/gems/
1.8/gems/mongrel-1.1.2-x86-mswin32/lib/mongrel/init.rb
(MissingSourceFile)

I did 'gem update mongrel' and it said :

Successfully installed mongrel-1.1.5-x86-mswin32-60

I noticed the version of the one installed is later than the one in
the mongrel error message.  Is there an older version of something
that is causing this?

I solved this by the following way

by changing the name of your
folder C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60  to
C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32

and it should work as usual

How to build Ruby On Rails projects using Hudson part -2

2008-10-10T09:43:00.000-07:00

CI::Reporter is an add-on to Test::Unit and RSpec that allows you to generate XML reports of your test and/or spec runs. The resulting files can be read by a continuous integration system that understands Ant‘s JUnit report XML format, thus allowing your CI system to track test/spec successes and failures.

Installation

CI::Reporter is available as a gem. To install the gem, use the usual gem command:

    gem install ci_reporter

To use CI::Reporter as a Rails plugin, first install the gem, and then install the plugin as follows:

    script/plugin install http://svn.caldersphere.net/svn/main/plugins/ci_reporter

Usage

CI::Reporter works best with projects that use a Rakefile along with the standard Rake::TestTask or Spec::Rake::SpecTask tasks for running tests or examples, respectively. In this fashion, it hooks into Test::Unit or RSpec using environment variables recognized by these custom tasks to inject the CI::Reporter code into the test or spec runs. If you‘re using the Rails plugin, step 1 is unnecessary; skip to step 2.

To use CI::Reporter, simply add the following lines to your Rakefile:

 require 'rubygems'
gem 'ci_reporter'
require 'ci/reporter/rake/rspec' # use this if you're using RSpec
require 'ci/reporter/rake/test_unit' # use this if you're using Test::Unit

Next, either modify your Rakefile to make the ci:setup:rspec or ci:setup:testunit task a dependency of your test tasks, or include them on the Rake command-line before the name of the task that runs the tests or specs.
```
 rake ci:setup:testunit test
```

Report files are written, by default, to the test/reports or spec/reports subdirectory of your project. If you wish to customize the location, simply set the environment variable CI_REPORTS (either in the environment, on the Rake command line, or in your Rakefile) to the location where they should go.

Source

You can get the CI::Reporter source using Git, in any of the following ways:

    git clone git://git.caldersphere.net/ci_reporter.git
   git clone http://git.caldersphere.net/ci_reporter.git
   git clone git://github.com/nicksieger/ci_reporter.git

How to build Ruby On Rails projects using Hudson

2008-10-10T09:21:00.000-07:00

In this guide I'm going to show how to set up a Ruby on Rails project on the Continuous integration server Hudson. I've been using Hudson on Ruby on Rails projects since september and it works really well.

Initial downloads

The following files are needed besides Java (at least 1.5). Get the latest version of all files and notice that the Hudson file has the extension .war and plugins .hpi. This guide assumes that Ruby, Rake and Svnplugin are already installed and working.

* Hudson server application

* Ruby plugin

* Rake

Installation steps

I'm going to install Hudson into c:\Program Files\Hudson.

Copy the hudson.war file to c:\Program Files\Hudson

Start Hudson through "java -DHUDSON_HOME=data -jar hudson.war". Verify that you can access Hudson through http://localhost:8080

Copy the plugins to c:\Program Files\Hudson\data\plugins

Stop Hudson by pressing Ctrl+C in the command prompt where you started Hudson.

Start Hudson again and you should be set to go.

Hudson system configuration

Follow the following steps to configure the tools that Hudson will use in building Your project.

Go to the System configuration at http://localhost:8080/configure.

Click the "New job" link at the home page.

Enter the name "Your project", check the "Build a free-style software project" and press OK.

Source code management

Assumes thata ur project uses a Subversion SCM. Hudson supports CVS and SVN out of the box, but there are many plugins for other SCMs. After checking out the files from the repository Hudson will show the new change sets since the previous build in the Build page. A detailed view of change sets can be seen in the Changes page as the name of the developer, files that were changed and the comment for the change. Each change set is linked to the subversion repository browser, so it is easy to browse the actual file that changed.

Press the Subversion radio button to configure the SCM.

Repository URL=https://xxx.svn.sourceforge.net/svnroot/xxx/trunk/xxx

Local module directory=.

Press the Advanced button

Repository Browser=ViewSVN, URL=http://xxx.svn.sourceforge.net/viewvc/xxx/

To test the configuration, press Save and then Build. The source code will be downloaded from the repository and put into the Workspace. If there were any changes in the SCM repository they can be viewed in the Changes page.

When the build is completed verify that it has checked out the code by going to the Workspace page. Using the Workspace page you can browse and view the files that has been checked out and it doesn't matter if the files are on the master or on a distributed slave!

When the plugin is avalable it detects your ruby instances installed from your PATH but it allows you to add other ruby or jruby paths:

Finally you just need to select the Invoke Rake option into the project configuration and select the tasks that you want to Hudson executes:

That's it, you are ready to go with Rake, Hudson and the Continuous Integration Game.

RESTful Rails in Short

2008-08-26T12:37:00.000-07:00

What is REST?
coined by Roy Fielding stands for REpresentational State Transfer
describes an architecture for web apps centered around resources

REST constraints

client-server
stateless
cache
uniform interface
layered system
code-on-demand

REST data elements

resource
resource identifier
representation
representation metadata
resource metadata
control data

Rails resource

manipulated via HTTP methods
URL addressable entity
represented in different formats

Rails resource manipulations

operation SQL REST
create insert POST
read select GET
update update PUT
delete delete DELETE

Rails resource URLs

Traditional Rails RESTful Rails
POST /post/create POST /post
GET /post/show/1 GET /post/1
POST /post/update/1 PUT /post/1
POST /post/destroy/1 DELETE /post/1

Creating a resource
./script/generate scaffold_resource \
post \
title:string \
content:text \
created_at:datetime

creates
model, views, controller, helper
fixtures, unit tests, functional tests,
migration (fully functional!)
modifies
config/routes.rb

Model
app/models/post.rb
class Post < ActiveRecord::Base
end
nothing new!

View
app/views/posts/show.rhtml

Title:<%=h @post.title %>

Content:<%=h @post.content %>

Created at:<%=h @post.created_at %>

<%= link_to ‘Edit’, edit_post_path(@post) %> |
<%= link_to ‘Back’, posts_path %>
new syntax for link_to URLs!

Views: routes
config/routes.rb
ActionController::Routing::Routes.draw do |map|
map.resources :posts
end
defines path methods and URL methods

Action `````HTTP request````````` Path method
index GET /posts projects_path
show GET /posts/1 project_path(1)
new GET /posts/new new_project_path
edit GET /posts/1;edit edit_project_path(1)
create POST /posts projects_path
update PUT /posts/1 project_path(1)
delete DELETE /posts/1 project_path(1)

new
form_for(:post, :url => post_path) ...
edit
form_for(:post, :url => post_path(@post), \
:html => {:method => :put}) ...
destroy
link_to ‘Destroy’, post_path(post), :method => :delete

Controller
app/controllers/posts_controller.rb
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.xml { head :ok }
end
end
uses respond_to and post_url

Controller: routes

Traditional Rails
redirect_to :controller => ‘posts’, \
:action => ‘show’, :id => @post.id

RESTful Rails
redirect_to post_url(@post)
Each path method has equivalent URL method
Remember: use URL methods for redirect_to

Controller: respond_to
multiple representations of the resource
respond_to uses
accept HTTP-Header of the request
format appended to the request URL
register new formats in config/environment.rb
to extend responds_to
Mime::Type.register ‘image/png’, :png

Migration

db/migrate/001_create_posts.rb
class CreatePosts < ActiveRecord::Migration
def self.up
create_table :posts do |t|
t.column :title, :string
t.column :content, :text
t.column :created_at, :datetime
end
end

def self.down
drop_table :posts
end
end

Nested resources
strongly coupled resources
expressed in the URLs
creating a nested resource

./script/generate scaffold_resource comment \
post_id:integer created_at:datetime \
author:string content:text

models
models must be edited to express relationship

app/models/post.rb

class Post < ActiveRecord::Base
has_many :comments
end
app/models/comment.rb
class Comment < ActiveRecord::Base
belongs_to :post
end

routes
routes must be edited to reflect relationship

config/routes.rb

map.resources :comments
becomes
map.resources :posts do |posts|
posts.resources :comments
end

Path method Path
comments_path(1) /posts/1/comments
comment_path(1, 2) /posts/1/comments/2
new_comment_path(1) /posts/1/comments/new
edit_comment_path(1) /posts/1/comments/2;edit

controller
nested resources controllers must be adapted
def index
post = Post.find(params[:post_id])
@comments = post.comments.find(:all)
...
end

REST benefits

clean URLS
multiple representations
less code
CRUD oriented controllers
clear application design
scalability

SQL Injection in Ruby On Rails

2008-08-22T12:58:00.000-07:00

SQL Injection
One of the most common security holes in web applications is that they pass user input
directly to the database without quoting. Thus, a malicious user can fairly easily run all the SQL
he wants to on the server. An example of this would be a search form submission that is handled
by the following code:

@courses = Course.find(:conditions => "name = '#{params[:q]'")

Now let’s say JHON puts the following string into the search form:

"science'; delete from courses; --"

The resulting SQL query will be as follows:

SELECT * from courses where name = 'science'; delete from courses; --'

This is a perfectly valid SQL query and will effectively wipe out the whole courses table. Thus,
you should never, ever, pass anything unquoted to the :conditions parameter of ActiveRecord
finders. Instead, use the bind variable syntax:

@courses = Course.find(:conditions => ["name = ?", params[:q]])

You can pass in as many question mark/variable pairs you need. They will be parsed and
quoted in the order they are specified.

Another option in simple cases is to use the magic finders, where the parameter value is
automatically quoted, too:
@courses = Course.find_by_name(params[:q])

Dojo Button and Rails Helpers

2008-08-19T10:32:00.000-07:00

Dojo Button and Rails Helpers

When i tried to use dojo buttons on rails partials , i felt happy about dojo widgets.

But if i have to use save_tag button or i want to include button in link_to_remote function,
I dont have option to get dojo style button.

I have used firebug to get the required dojo classes for dojo button and created following helper methods.

def dojo_button(name)
''
end
def dojo_button_class
"dijit dijitLeft dijitInline dijitStretch dijitButtonNode dijitButtonContents dijitButton"
end

save_tag to avoid multiple click in IE and Firefox

2008-08-19T10:12:00.000-07:00

##############################################################################
# Overrides sumit_tag for disable save after click event --JAGAN REDDY
##############################################################################
def commit_tag(value,options={})
options.stringify_keys!
submit_tag value, options.merge(:onclick => '

if(window.addEventListener)
{
this.disabled = true;
}
else
{ // IE
var element = window.event.srcElement;
var tag = element.tagName.toLowerCase();
if(tag == "input")
{
var click = element.onclick;
var keypress = element.onkeypress;
setTimeout(function() { element.disabled = true; element.onclick = null; element.onkeypress = null; }, 0);
setTimeout(function() { element.disabled = false; element.onclick = click; element.onkeypress =keypress; }, 20000);
}
}
')
end
use this in apllication_helper.rb

Ruby: Floating point round off

2008-07-23T16:04:00.000-07:00

my method of doing this as

def round(float, decimal_places) # By Jagan Reddy
exponent = decimal_places + 2
@float = float*(10**exponent)
@float = @float.round
@float = @float / (10.0**exponent)
end

In short we can also do this way

class Float
 def round_to(i)
   (self * 10**i).round.to_f / 10**i
  end
end
value = 1328.3337
value.round_to(3)
=>1328.334

New AJAX google api rails plugin coming soon

2008-07-11T13:29:00.000-07:00

Check this link for sample google ajax rails helper modules ...

http://www.strictlyuntyped.com/2008/06/using-google-ajax-libraries-api-with.html

Error can't dump anonymous class Class (apatana studio)

2008-07-11T13:21:00.000-07:00

The system has a mainDocument model with different subclasses for different types of documents.
With the code below, if I attempt to create a Document, it works fine, but
if I attempt to use one of the subclasses, I get the error:

can't dump anonymous class Class

With an Application Trace of:

C:/Ruby/lib/ruby/1.8/yaml/rubytypes.rb:6:in `to_yaml'

When i started using aptana studio (radrails) 1.1.6 etc.. i got this error.

I searched all over the net for rails or ruby error list for this kind.. i could not find this problem any where.

But it solved when stopped apatana from dubugging mode to regular mode.

I dont know why but it works me fine afterwards.

please put your comments if u find any other soultion

What is Rubinius ?

2008-05-21T15:11:00.000-07:00

Evan Phoenix's Rubinius project is an effort to implement Ruby using as much Ruby code as possible. It is not, as professed, "Ruby in Ruby" anymore. Rubinius started out as a 100% Ruby implementation of Ruby that bootstrapped and ran on top of MatzRuby. Over time, though the "Ruby in Ruby" moniker has stuck, Rubinius has become more or less half C and half Ruby. It boasts a stackless bytecode-based VM (compare with Ruby 1.9, which does use the C stack), a "better" generational, compacting garbage collector, and a good bit more Ruby code in the core libraries, making several of the core methods easier to understand, maintain, and implement in the first place.

The promise of Rubinius is pretty large. If it can be made compatible, and made to run fast, it might represent a better Ruby VM than YARV. Because a fair portion of Rubinius is actually implemented in Ruby, being able to run Ruby code fast would mean all code runs faster. And the improved GC would solve some of the scaling issues Ruby 1.8 and Ruby 1.9 will face.

Rubinius also brings some other innovations. The one most likely to see general visibility is Rubinius's Multiple-VM API. JRuby has supported MVM from the beginning, since a JRuby runtime is "just another Java object". But Evan has built simple MVM support in Rubinius and put a pretty nice API on it. That API is the one we're currently looking at improving and making standard for user-land MVM in JRuby and Ruby 1.9. Rubinius has also shown that taking a somewhat more Smalltalk-like approach to Ruby implementation is feasible.

Rails on Virtual Machine

2008-05-21T15:06:00.000-07:00

There was a short note today, that the Rubinius development team has successfully run Rails on their virtual machine. Although isn’t anywhere new production ready yet, it is a significant step forward in getting a faster Rails.

I covered some of the alternate Ruby implementations previously.

Congratulations to the team!

Rails Development Tips part-2

2008-05-21T15:00:00.000-07:00

Use database indexes to speed up queries. Rails only indexes primary keys, so you’ll have to find the spots that need more attention.
Profile your code. The ruby-prof gem and plugin helped me make an application three times faster with only minimal changes to the code.
Minimize graphic-related dependencies. If your application only needs to make a few thumbnails, don’t waste memory by importing large graphics libraries. Look at mini-magick or image_science for lightweight thumbnailing.
Avoid excessive repeated rendering of small partials.
Use CSS instead of inline tags to apply selective styling.
Don’t use ActiveRecord’s serialize option to store large objects in database fields.
Use attr_protected :fieldname in models to keep database fields from being manipulated from forms (or from any calls to Model.update_attributes(params[:model])).
Use Ruby classes and inheritance to refactor repeated controller code.
Use unobtrusive Javascripting techniques to separate behavior from markup.
Package self-sufficient classes and modules as plugins or RubyGems.
Cache frequently accessed data and rendered content where possible.
Write custom Test::Unit assertions or rSpec matchers to help with debugging test suite errors.
Rotate the Rails and Mongrel logfiles using the logrotate daemon on Linux.
Build a reliable backup system.
Automate deployment and maintenance with Capistrano or Vlad.
Keep method bodies short. If a method is more than 10 lines long, it’s time to break it down and refactor.
Run flog to determine overly complex methods and clases.
Don’t use too many conditionals. Take advantage of case statements and Ruby objects to filter instead of multiply-nested if statements.
Don’t be too clever. Ruby has great metaprogramming features, but they are easy to overuse (such as eval and method_missing).
Become familiar with the most popular plugins. Instead of re-implementing the wheel, save yourself some time by using well tested, popular plugins

source :http://nubyonrails.com/articles/massive-list-of-rails-development-tips

Rails Development Tips or Hints part 1

2008-05-21T14:59:00.000-07:00

Store sessions in the database (or at least not on disk, which is the default).
Use a custom configuration file for passwords and API keys instead of storing them in your Subversion repository. I use YAML and mirror the style of database.yml.
Use constants where needed. Instead of repeating strings like the address of your customer service reply email, set it once in a constant (in environment.rb or the appropriate environment file) and use that throughout your application.
Keep time in UTC. A no brainer, and easy to do.
Don’t loop through ActiveRecord models inside other models. Use eager loading if you need to work with multiple associated models. Better yet, write a custom SQL query and let the database do the work for you.
Beware of binary fields. By default, all fields are returned with queries, including the full contents of any binary fields. Use :select to pull out only the fields you need.
Write tables to cache data for reports that span months and years. It’s much faster than re-generating a year’s worth of reports every time a page is loaded.
Create a table with a list of country names. By default, Rails uses strings for selects and lists of countries, which doesn’t work well for reporting or database consistency between models.
Avoid bloated controllers. Instead of piling actions into a controller, limit yourself to 10 actions per controller, then rethink your design.
Keep your controllers and views skinny. In general, most of your code should be in your models, not your controllers or views.
Don’t store objects in the session. Use integers or short strings if necessary, then pull the appropriate object out of the database for the duration of a single request.
Avoid heavy response processing. Can you mark a record as needing to be processed, then use a cron job or a messaging server to do the long-running work? BackgroundRB is also an option. (I use this technique for filtering SPAM comments on this blog).
Use ar_mailer to queue bulk emails instead of sending them during the Rails response cycle.
Monitor your servers with the exception_notification plugin, munin, monit, or other tools.
Don’t cut costs on hardware. You’ll quickly lose the money you thought you were saving if your developers have to spend even one day a month on unexpected server maintenance due to poor backups or cheap hardware.
Test-drive your development.

If, Else, and Elsif Constructs

2007-12-27T12:44:00.000-08:00

Too many if else statements can create confusion for ruby developers. If so better to refactor the code. Ruby is such an amazing object oriented language that this procedural garbage is the quickest way to ugly, unreadable code.

if you ever write something like this:

123	if my_object!= my_object_notif my_object!= nil

If you wanna take the advantage of ruby use the following code for better readability

unless my_object== my_object_else
unless my_object.nil?

ActiveRecord partial updates

2007-12-27T12:36:00.000-08:00

ActiveRecord updates all the columns when you save the object, without bothering to see if the column was changed or not.

Pratik Naik has given the solution for partial updates on changes.

http://m.onkey.org/2007/12/18/partial-updates

Make sure that you use optimistic locking.

Active Records support optimistic locking if the field lock_version is present. Each update to the record increments the lock_version column and the locking facilities ensure that records instantiated twice will let the last one saved raise a StaleObjectError if the first was also updated.

Rails Plugins - Query Analyzer

2007-12-20T08:18:00.000-08:00

The Query Analyzer plugin will expand the usability of your log files by providing query analysis using the MySQL query execution plan. Each SQL select query will be ‘EXPLAIN’ed and added to the log files right below the original query.

Installation

script/plugin install http://svn.nfectio.us/plugins/query_analyzer

Example Use

Refer to http://www.mysql.org/doc/refman/5.0/en/explain.html for more information on understanding the results.

http://www.rubyinside.com/columnized-text-datasets-in-rails-71.html http://habtm.com/articles/2006/06/10/pretty-tables-for-ruby-objects

Latest bug fixes for ruby pdf-writer 1.1.4

2007-12-19T14:48:00.000-08:00

* Better memory footprint for PDF::SimpleTable
* Fixed an error with BMP images in ImageInfo#measure_BMP
* Temporary removal of encryption functionality, as it seems to have
numerous issues
* Resolved an issue with ordering of column names in PDF::SimpleTable
* Resolved an issue with shading in PDF::SimpleTable
* Applied a patch to allow toggling visible column separators in QuickRef
* Partially fixed issues with page numbering

rubyvmware-0.3-release

2007-12-19T14:46:00.000-08:00

Rewrite all initialization codes. More OO and rubish.
Add VMware::VM class with poweron,poweroff,reset,suspend methods.
Try to move to VIX 1.2.

Track latest rubyvmware: http://rubyvmware.rubyforge.org

Ruby gem youtube-g version 0.4.0 has been released!

2007-12-19T14:42:00.000-08:00

Aims to be in parity with Google's YouTube GData API

Basic queries:

@client = YouTubeG::Client.new
@client.videos_by(:query => "penguin")
@client.videos_by(:tags => ['tiger', 'leopard'])
@client.videos_by(:categories => [:news, :sports])
@client.videos_by(:categories => [:news, :sports], :tags => ['soccer', 'football'])
@client.videos_by(:user => 'liz')

Standard feeds:

@client.videos_by(:most_viewed)
@client.videos_by(:top_rated, :time => :today)

Advanced queries (with boolean operators OR (either), AND (include), NOT (exclude)):

@client.videos_by(:categories => { :either => [:news, :sports], :exclude => [:comedy] }, :tags => { :include => ['football'], :exclude => ['soccer'] })

## INSTALL

* sudo gem install youtube-g

Just One Word about RailsConf Europe

2007-12-10T15:09:00.001-08:00

The First Rails 2.0 Screencast (english)

2007-12-10T14:56:00.000-08:00

Online Videos by Veoh.com

Calculating Time difference in Ruby

2007-11-29T15:03:00.000-08:00

require 'date'
now = DateTime.new
date = Date.new
p now.strftime("%Y-%m-%d %I:%M:%S").to_s
p Time.now.strftime("%Y-%m-%d %I:%M:%S").to_s
dif = DateTime.parse(Time.now.strftime("%Y-%m-%d %I:%M:%S").to_s)-DateTime.parse("2007-9-12 14:07:00")
hours, mins, secs, ignore_fractions = Date::day_fraction_to_time(dif)
p hours * 60 * 60 + mins * 60 + secs

Pdf-writer -- Images in simple table

2007-11-20T13:11:00.000-08:00

When using pdf-writer using ruby programming language, simple table always gives option of using text in the rows. I did not have an option to use images inside simple table as it uses data as

attr_accessor :data
# An array of Hash entries. Each row is a Hash where the keys are the
# names of the columns as specified in #column_order and the values are
# the values of the cell.

The following is the code change in simpletable.rb file is required to use images in respected cells.

line : 647
if(line.match("::Image"))
pic = line.gsub("::Image","")
line = pdf.add_image_from_file(pic,pos[name], pdf.y-5, @image_width)
line =""
else
line = pdf.add_text_wrap(pos[name], pdf.y,
max_width[name], line,
@font_size, just)
end

Note: Make sure that text should have "::Image" and remaing text is the path of the image .

like

data[i]["Q1Image"] ="::Image"+Dir.getwd+"/public/images/status_#{p.status_q1_image}.jpg"

For more information please post your comments.

Anand Agarawala: BumpTop desktop is a beautiful mess

2007-11-09T13:49:00.000-08:00

Ruby and Related Links

2007-05-01T10:42:00.000-07:00

http://www.oreillynet.com/ruby/blog/2006/05/post.html
(Zed on Ruby, Rails, Mongrel, and More)
Rails:
http://www-128.ibm.com/developerworks/java/library/j-cb08016/

Rails Deployment:
http://blog.duncandavidson.com/2005/12/deploying_rails.html
http://www.infoq.com/news/2006/12/deploy-rails-on-iis

Rails Migrations:
http://glu.ttono.us/articles/2005/10/27/the-joy-of-migrations
http://garrettsnider.backpackit.com/pub/367902

Scriptaculous Rails:
http://script.aculo.us/
http://www.juixe.com/techknow/index.php/2006/08/12/scriptaculous-rails/

Rest:
http://www.b-simple.de/documents

Second Life:
http://secondthoughts.typepad.com/second_thoughts/2006/06/getting_started.html
http://nwn.blogs.com/

Design Patterns:
http://www.dofactory.com/Patterns/Patterns.aspx

Agile SD:
http://www.adaptivesd.com/articles/cross_oct02.pdf

Arjun Singh and the Love Goddess!

2007-01-14T09:16:00.000-08:00

So what does the Love Goddess have to do with Arjun Singh and with reservations? As the Indian government, at the behest of Arjun Singh, rolled out yet another short sighted policy to deal with the horrible caste system, we found out about some other activities of Arjun Singh.

ExampleDesignPatternsInRuby (Ruby)

2006-12-28T08:31:00.000-08:00

Almost all of these examples are correct Ruby programs. If example output is shown, you should be able to copy code from the web page, run it in a Ruby interpreter and get the documented output.

Patterns

Source:http://wiki.rubygarden.org/Ruby/page/show/ExampleDesignPatternsInRuby

Design Patterns in Ruby : Observer

2006-12-28T08:28:00.000-08:00

The key ideas around the Ruby implementation of the Observer pattern are:

Require the observer library
Mixin the Observable module to your class which can be observed
In the class that does the observing, implement the update method

That’s it.

Of course, an example would be nice. Here’s a small one.

require 'observer'  # Key step 1

class MyObservableClass
  include Observable  # Key step 2

  def blah
    changed  # note that our state has changed
    notify_observers( 5 )
  end
end

class MyObserverClass
  def update(new_data)  # Key step 3
    puts "The new data is #{new_data}"
  end
end

watcher = MyObservableClass.new
watcher.add_observer(MyObserverClass.new)

Now, any time that MyObservableClass#blah is called, the observing classes will get notified. In this example, we aren’t dynamically changing the data (in fact, it always stays constant), but I think you can see that if in fact the data DID change, the observers would all get notified of that change.

Design Patterns in Ruby : Singleton

2006-12-28T08:17:00.000-08:00

Singleton pattern in Ruby just simple. Only thing is you need to include singleton module. Lets look at sample ruby program.

require 'singleton'
class MyClass
include Singleton
end

sing Ruby’s powerful Mixin functionality, we bring the singleton code into our class definition. This automatically makes our class’s new method private, and give us an instance method we can use to get our object:

irb(main):005:0> a = MyClass.new
NoMethodError: private method `new' called for MyClass:Class
from (irb):5
irb(main):006:0> a = MyClass.instance
=> #

Ajax Stories Using Microsoft ATLAS

2006-12-13T12:28:00.000-08:00

Video: Using Microsoft Atlas 01

Video: Using Microsoft Atlas 02

Video: Using Microsoft Atlas 03

Building a Blog with Rails

2006-12-13T12:25:00.000-08:00

Video: Building a Blog with Rails

What is Chrome URL ?

2006-12-13T11:57:00.000-08:00

You can get XUL files like regular HTTP URL or like HTML files.
URL types can automatically handle mulitple themes and locales.
The basic syntax of a chrome URL is as follows:

chrome:////

The text is the package name, such as messenger or editor. The is either 'content', 'skin' or 'locale' depending on which part you want. 'file.xul' is simply the filename.

Example: chrome://messenger/content/messenger.xul

When you select a chrome URL, Mozilla looks down its list of installed packages and tries to locate the JAR file or directory that matches the package name and part.

The mapping between chrome URLs and JAR files are specified in the manifest files stored in the chrome directory.

If you were to move the file messenger.jar somewhere else and update the manifest file accordingly, Thunderbird will still work since it doesn't rely on its specific installed location. By using chrome URLs we can leave details like this to Mozilla. Similarly, if the user changes their theme, the 'skin' part of the chrome URL translates to a different set of files, yet the XUL and scripts don't need to change.

Here are some more examples. Note how none of the URLs specify which theme or locale is used and none specify a specific directory.

chrome://messenger/content/messenger.xul
chrome://messenger/content/attach.js
chrome://messenger/skin/icons/folder-inbox.png
chrome://messenger/locale/messenger.dtd

Why should I upgrade to windows Vista

2006-12-12T08:44:00.000-08:00

Last week i bought laptop with all latest configuration. Due to vistas late release i have to satisfy with XP professional SP2. AS far I know XP with SP2 provides lot of security than the latest Vista as it has already been tested for long years. Suppose if i need to upgrade to vista.. My printer will not work... may be some installations will not work.

The only reason looking for Vista is Aero glassy features and security. It requires high quality PC components.

According to Itwire ,Many know that the software cost of upgrading from Windows XP to Windows Vista Business is US$199 but they might not know that the Vista upgrade carries a hardware cost as well, with about US$100 in new or additional PC components required to make the jump to Microsoft's newest operating system, according to research firm iSuppli.

However, Vista allows users the option of disabling the 3D interface, eliminating the need for a new graphics card or a more powerful integrated graphics chip. Whether or not to pay the additional costs required to obtain the 3D functionality is a choice that individual users or companies must make.

why a business user, small or large, have to upgrade to Vista just becuase Windows XP has finally matured? We can't think of a single reason other than the fact is that from January 30, 2007, Microsoft will stop selling Windows XP and eventually we'll be forced to move to Vista - or something else. They wanna capture the market by forcing the users or businesses to get vista

What is XUL and Its role in Mozilla/Firefox browser

2006-12-08T07:55:00.000-08:00

What is XUL and why was it created?

XUL is developed to make firefox/mozilla browser easily and faster.
It follows XML structure and schemantics.
Even MathML or SVG can be inserted within it.

WE can make the following elements:
* Input controls such as textboxes and checkboxes
* Toolbars with buttons or other content
* Menus on a menu bar or pop up menus
* Tabbed dialogs
* Trees for hierarchical or tabular information
* Keyboard shortcuts

The created applications can be used as :
Firefox extension
Standalone XULRunner application
XUL package
Remote XUL application

Before learning XUL u need to know the following:
XML(DOM),
HTML,
CSS,
JavaScript and latest firefox browser

You can use same CSS properties in XUL just like HTML CSS.

THe XUL can be accessed from Browser using Chrome URL.
'chrome://' Your URL -> refers installed packages and extensions.

if you are going to use XUL on a web site, you can just put the XUL file on the web site as you would an HTML file, and then load its URL in a browser. Ensure that your web server is configured to send XUL files with the content type of 'application/vnd.mozilla.xul+xml'. This content type is how Mozilla knows the difference between HTML and XUL.

Mozilla does not use the file extension, unless reading files from the file system, but you should use the .xul extension for all XUL files. You can load XUL files from your own machine by opening them in the browser, or by double-clicking the file in your file manager. Remember that remote XUL will have significant restrictions on what it can do.

Firefox uses different documents types for :HTML, XML and XUL
Naturally, the HTML document is used for HTML documents, the XUL document is used for XUL documents, and the XML document is used for other types of XML documents. Since XUL is also XML, the XUL document is a subtype of the more generic XML document.

To summarize the points made above:

* Mozilla renders both HTML and XUL using the same underlying engine and uses CSS to specify their presentation.
* XUL may be loaded from a remote site, the local file system, or installed as a package and accessed using a chrome URL. This is what browser extensions do.
* Chrome URLs may be used to access installed packages and open them with enhanced privileges.
* HTML, XML and XUL each have a different document type. Some features may be used in any document type whereas some features are specific to one kind of document.

Example of buttons:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window
    id="findfile-window"
    title="Find Files"
    orient="horizontal"
    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <button id="find-button" label="Find"/>
  <button id="cancel-button" label="Cancel"/>

</window>

Tech-Online Videos

2006-12-04T10:33:00.001-08:00

Video: Favourites Center in IE7

Video: RSS Feeds

Video: ASP.NET und RSS feeds

Video: Vista Aurora Desktop?

Video: Microsoft Zune

Video: Microsoft Home

Video: Vista, wallpaper

Video: Xp and Vista

Video: Bill Gates on Open Source

Video: View on Vista - Windows Meeting Space

Video: Views On Vista - Reliability Monitor

Video: Desktop Search in Windows Vista

Ruby books :

2006-12-01T13:55:00.000-08:00

Programming Ruby: A Pragmatic Guide2nd edition.

Making Use of Ruby by Suresh MahadevanWiley; ISBN 0-471-21972-X (2002)

Teach Yourself Ruby in 21 Daysby Mark SlagellSams; ISBN: 0672322528 (March, 2002)

Ruby Developer's Guideby Michael Neumann, Robert Feldt, Lyle JohnsonPublishers Group West; ISBN: 1928994644 (February, 2002)

The Ruby Wayby Hal FultonSams; ISBN: 0672320835 (December, 2001)

Ruby In A Nutshellby Yukihiro MatsumotoO'Reilly & Associates; ISBN: 0596002149 (November, 2001)

Programming Ruby: A Pragmatic Guideby Dave Thomas and Andrew HuntAddison Wesley; ISBN: 0201710897 (2000)(As of Sept 2004, there is a second edition. It is not open- sourced at this time.) Online version(Note that this is a legal first edition.)
Download Errata

What is Ruby?

2006-12-01T13:52:00.000-08:00

What is Ruby?
Ruby is a very high level, fully OO programming language. Indeed, Ruby is one of the relatively few pure OO languages. Yet despite its conceptual simplicity, Ruby is still a powerful and practical "industrial strength" development language.

Ruby selectively integrates many good ideas taken from Perl, Python, Smalltalk, Eiffel, ADA, CLU, and LISP. Ruby combines these ideas in a natural, well-coordinated system that embodies the principles of least effort and least surprise to a substantially greater extent than most comparable languages — i.e., you get more bang for your buck, and what you write is more likely to give you what you expected to get. Ruby is thus a relatively easy to learn, easy to read, and easy to maintain language; yet it is very powerful and sophisticated.

In addition to common OO features, Ruby also has threads, singleton methods, mixins, fully integrated closures and iterators, plus proper meta-classes. Ruby has a true mark-and-sweep garbage collector, which makes code more reliable and simplifies writing extensions. In summary, Ruby provides a very powerful and very easy to deploy "standing on the shoulders of giants" OO scaffolding/framework so that you can more quickly and easily build what you want to build, to do what you want to do.

You will find many former (and current) Perl, Python, Java, and C++ users on comp.lang.ruby that can help you get up to speed in Ruby.

Finally, Ruby is an "open source" development programming language.

XAML vs XUL vs MXML Comparision

2006-11-30T11:05:00.000-08:00

MXML
Runs anywhere Flash Player 7
Server required
Uses ActionScript 2.0
XPath support: no
CSS support: limited

XAML
runs Runs only on Longhorn
Server not required
Uses .NET languages
XPath support: yes
CSS support: no

XUL
Runs on any platform.
Server Not Required
Javascript, Python, C++
XPath support: yes
CSS Support: excellent.

Ajax Stories

2006-11-29T07:49:00.000-08:00

ASP.NET AJAX under the hood secrets
By Omar Al Zabir.

Take look at this site aspnetajaxtips .You will find advantages and disadvantages of Batch calls, AJAX call timeouts, browser call jam problem, ASP.NET 2.0's bug in web service response caching, and so on. This guy (Omar Al Zabir) has created Pageflakes website. He is MVP professional. I recommend every Asp.Net professional look at his work and samples.
He gives answer to this question "Why did not you use Protopage or Dojo library?"

AJAX Demos
Basic AJAX Examples The downloadable samples include full JavaScript & Java Source, a sample database for any SQL database, and a PowerPoint presentation. This sampler shows some basic techniques to demonstrate some of the possibilities of using AJAX/XMLHTTPRequest techniques in web applications. Basic browser & server interaction is demonstrated along with dynamic population of visual elements such as DIVs and SELECT drop downs.In addition, many ways of instantiating & encapsulating XMLHTTPRequest objects are shown in the Javascript.
-->Drag & Drop Sortable Lists with JavaScript and CSS In Web applications I've seen numerous, and personally implemented a few, ways to rearrange items in a list. All of those were indirect interactions typically involving something like up/down arrows next to each item. The most heinous require server roundtrips for each modification...boo.
-->FireBug FireBug is a new tool for Firefox that aids with debugging Javascript, DHTML, and Ajax. It is like a combination of the Javascript Console, DOM Inspector, and a command line Javascript interpreter.
-->AjaxAnywhere Ajax JSP Components.
-->fileNice PHP and AJAX file browser.
-->AJAX Instant Edit Example In spanish.
-->
AJAX Drag and Drop
Dragable RSS boxes This is is a script that uses Ajax to read data from external RSS sources and display them inside dragable boxes. You can also create new boxes dynamically directly from the page.

-->Fun with Drag and Drop with RICO For those of you who haven't seen Rico its another AJAX library, with quite a few cool extras. What I'm going to cover here is my first expiriment with Rico and their 'drag and drop' functionality. Getting basic drag and drop functionality is extremely easy with this library, and with just a bit of modification you can easily make it fit whatever you could want.
-->
AJAX Email
Take AJAX to Your Email Inbox: Developing a Web-based POP 3 Client In this article, the first of three parts, you will start creating a simple web-based POP 3 client using AJAX, which will use "XMLHttpRequest" objects to retrieve messages from a mail server.

-->Ajax Workshop 1: Ajax Basics & Building a Simple Email Verification With Prototype.js
In this introduction we will build a simple form (I know it says not to use AJAX for simple forms, but it is an easy example) that submits a user's information to the database and confirms if the user's email address is already in the database. We will be using a common JavaScript library by the name of prototype.js.
-->Zimbra
Open source AJAX email program
-->
AJAX File Uploaders
CakeTimer - Demo Page An Ajax file uploads progress bar This is a demonstration of an AJAX powered progressbar to monitor file uploads with (Cake)PHP. Yes you've heard right! Well, but before you begin to drool all over the place, there is one downside: it requires a Perl script that allows you to know the upload progress. But besides this little downer you have a maximum of flexibility regarding the design of your progress-bar and integration in your system.
-->
AJAX Flash
Incito - Interactive Everything SwfJax is a new approach to asynchronous JavaScript and XML applications using revolutionary Flash technology. SwfJax uses a lightweight SWF (Adobe's Small Web Format or simply - Flash) engine to get XML data from the server and xPath (XML Path Language) to address a part of data it has retrieved. Data can be returned back to Javascript as an Array. You can also send multiple xPath queries at once.
-->AFLAX: The AJAX Library for the Adobe Flash Platform Mar 15, 06 AFLAX (Wikipedia Entry) stands for Asynchronous Flash and XML. Defined simply, AFLAX is a development methodology which combines Ajax and Flash to create more dynamic web based applications. Developed by Paul Colton, the AFLAX technology is available as a library that enables developers to use JavaScript to fully utilize all of the features of Adobe's Flash runtime -- including graphics, networking, video and camera support.
-->
AJAX Forms
HTTP Authentication with HTML Forms Authentication in Web applications has been highjacked, HTTP defines a standard way of providing authentication but most apps use the evil spawn of Netscape, otherwise known as cookies. Why is this? Cookies aren't designed for authentication, they're a pain to use for it, insecure unless you know what you're doing, non-standard, and unRESTful.
-->FormSpring Online AJAX powered from builder.
-->Niceforms Web forms. Everybody knows web forms. Each day we have to fill in some information in a web form, be it a simple login to your webmail application, an online purchase or signing up for a website. They are the basic (and pretty much the only) way of gathering information on the web.
-->Capxous - AutoAssist AutoAssist is an auto completion web widget that written in pure JavaScript. It can help enhance the accessibility of existing website, let the users to work effective and feel comfortable. Moreover, it just a pure JavaScript file that won't break existing code or development style. (Related post: http://capxous.com/autoassist/)
-->Cake Baker - Submit a Form With AJAX The new release of CakePHP (RC2) comes with a completely rewritten AjaxHelper::form() function (with the disadvantage that it breaks existing code).
-->Wufoo - AJAX Form BuilderWufoo is a web-based tool to help you build and host amazing online forms. In only a few short minutes, you can create a mailing list, a marketing survey or even a complete customer management system.
-->Accessible Forms and Unobtrusive Javascript - dotvoid.com I usually try to separate backend logic from the user interface logic when creating new PHP applications. I am pro fat gui and usually have a lot of client side scripting going on. I mostly use AJAX or other remote scripting techniques to call actions defined in the PHP backend.
-->jotForm jotForm is the first web based WYSIWYG form builder.

Latest news on karimnagar byelection

2006-11-28T14:00:00.001-08:00

For more recent news features related to this topic, please click on a link to the left.
Skull struggle
Bill by BJp
Telangana in 2009 by Venkat Swamy
bedi workers strike
bedi workers strike
Bypoll campaign intensifiesDattatreya and Digvijay Singh to tour Karimnagar

TRS chief files nominationKick starts election campaign

TDP candidates file nominations for by-electionsL. Ramana to stand in Karimnagar

By polls for Karimnagar and Bobbili on December 4, 2006Congress, TDP, BJP and TRS have already announced their candidates

Karimnagar by pollL. Ramana picked as TDP candidate

BJP plans yatra in KarimnagarAims at exposing hollows of other parties

T Jeevan Reddy for Congress nominee for Karimnagar by pollCongress Party makes surprise move

TRS TDP men join Congress PartyCongress party gains strength amidst Karimnagar by-election

APCC to draft the services of Ministers and MLAs for Karimnagar electionCongress party presses top core team for elections

Rebel TRS MLA Mandadi asks voters to vote for Congress or BJPSays party lacks internal democracy

KCR named TRS candidate for Karimnagar seatTRS calls party members to teach Congress and TDP a lesson

Ch Vidyasagar Rao is BJP candidate for Karimnagar by pollState unit proposes his name unanimously

Karimnagar byelection

2006-11-28T13:50:00.000-08:00

Professors fan out in the constituency and visit interior villages

KARIMNAGAR: TRS president K. Chandrasekhar Rao has found a new set of campaigners in the teaching faculty of Osmania and Kakatiya Universities and Non-Resident Indians, who have rallied behind him in the run-up to the Karimnagar byelection.

Led by the former dean of social sciences, Osmania University, Madhusudhan Reddy and K. Laxman of Philosophy Department, the teachers are fanning out in the Karimnagar parliamentary constituency visiting interior villages and seeking votes for the TRS chief and urging them to uphold the `self-esteem of Telangana'.

A 30-member team of professors has divided itself into small groups to cover all the seven Assembly segments. More than 300 students from OU are going round villages educating the voters on the need for the creation of a separate State.