Error running 'requirements_brew_libs_install libksba' or libgpg-error Ruby 2.0.0 on MAC, brew and RVM

Problem: 
If you have problem installing ruby 2.0.0 on your mac using rvm and brew. And the problem could be timeout error .

rvm install ruby-2.0.0-p0

Installing requirements for osx, might require sudo password.
Already up-to-date.
Installing required packages: libksba....
^CError running 'requirements_brew_libs_install libksba',
please read /Users/XXX/.rvm/log/ruby-2.0.0-p0/package_install_libksba.log

log file :

(curl: (56) Recv failure: Operation timed out)


Solution: 

vi  /usr/local/Library/Formula/libgpg-error.rb
Replace: url 'ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.9.tar.gz'
with  url 'http://www.mirrorservice.org/sites/ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.11.tar.gz'

same case with libksba

This should works if it complain sha1 stuff replace expected one on ruby code.

Brew Update issue

$ brew update
error: The following untracked working tree files would be overwritten by merge:
    Library/Formula/libmusicbrainz.rb
Please move or remove them before you can merge.
Aborting
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master

Solution: 

rm /usr/local/Library/Formula/libmusicbrainz.rb
brew update

Rails pg gem '0.14.1' on Mac fails and solution

pg.c: In function ‘Init_pg_ext’:
pg.c:384: error: ‘PQPING_OK’ undeclared (first use in this function)
pg.c:384: error: (Each undeclared identifier is reported only once
pg.c:384: error: for each function it appears in.)
pg.c:386: error: ‘PQPING_REJECT’ undeclared (first use in this function)
pg.c:388: error: ‘PQPING_NO_RESPONSE’ undeclared (first use in this function)
pg.c:390: error: ‘PQPING_NO_ATTEMPT’ undeclared (first use in this function)
make: *** [pg.o] Error 1

Solution:
env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Library/PostgreSQL/9.2/bin/pg_config

EDIT :
If you dont know where your pg_config is. Assume you are on Linux/Mac system, using the command 'find' should help

find / -name pg_config

How to copy postgresql data from heroku production

Steps to get the copy of heroku deployed application database to localhost .

1 step: Create a backup on heroku production
       
           heroku pgbackups:capture --expire

2 step:  Get the latest back up to local by curl method

           curl -o backup.dump `heroku pgbackups:url`
3 step: Restore to localhost database using the followng comand
  
   pg_restore --verbose --clean --no-acl --no-owner -h localhost -d your_database_name  backup.dump

In Ruby, private methods are visible in derived classes

    class Base
    private
      def hello

      end
    end

then methods in the derived class can call it:

    class Derived < Base
      def say
        hello # this is allowed in Ruby
      end
    end 

Simply to say this :

in C++ and OOP languages, “private” means “private to this class”, 

while in Ruby it means “private to that instance”. Again here class is itself an object :-)

Thats means private method will have only one receiver that is self.

Features of Ruby on Rails 4.0

Features of Rails 4.0:
    •    strong_parameters
    •    Rails.queue
    •    Turbolinks
    •    Russian Doll Caching (cache_digests)
    •    ActionController::Live (streaming)
    •    PATCH verb
    •    Routing concerns
    •    Extraction of activeresource
    •    ActiveRecord::Relation changes and improvements
    •    Removal of plugin support (not gems; only those that are installed in vendor/plugins)
    •    Removal of Rails 2 finder syntax
    •    Deprecation of most dynamic finders
    •    Deprecation of eager-evaluated scopes

Slide deck: speakerdeck.com/u/alindeman/p/rails-4-dot-0-whirlwind-tour

Video:  http://vimeo.com/51181496

tooltipclass.js for drop down options when mouse over

code : https://github.com/reddyonrails/tooltipclass.js 

Description:
 This code is to tooltip drop down option when mouse over. TooltipClass uses json data source .
If this datasource is empty will fetch from ajax url passed from source list url.

You can set a template for each tooltip for drop down box.

sample source params to select particular select box.

Usage:
var dataSourceList = {
    'portfolio': {
        'targetElement': '#analysisjob_portfolio_id',
        'url': '/portfolios',
        'sourceName': 'portfolio',
        'primaryKey': 'portfolio.PortfolioId',
        'jasonData': {},
        'template': "" +
            "<%= item.Name%>" + "
" +
            "<%= item.Description%>" + "
" +
            ""
     }
}
targetElement : select box id
url: ajax url to fetch data
sourceName: json root
primaryKey: key with which we search for json data for each option
template: you can define tooltip structure

loadSource and call tooltipify function like this :
       var source = dataSourceList.portfolio
       var test = TooltipClass.initialize(source);
        test.toolTipfy();

Requirements:
http://twitter.github.com/bootstrap/javascript.html (tooltip,popover)
jquery
underscore.js

Tested in firefox