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Short Introduction to Rails

Install:

Overview useful components: ruby-toolbox.com

Must haves:

  • homebrew /macports
  • git
  • rvm

Load RVM extensions + completion

    [[ -s $HOME/.rvm/scripts/rvm ]] && source $HOME/.rvm/scripts/rvm
    [[ -r $rvm_path/scripts/completion ]] && . $rvm_path/scripts/completion

create proj folder:

 $ mkdir  'test'

create .rvmrc

  $ rvm use ruby-1.9.2-rc2@test --create

Init git

  $ git init

Interesting gems:

  rake (0.8.7)
  bundler (1.0.7)
  cheat (1.3.0)
  gemedit (0.9.0)
  gist (2.0.0)
  git (1.2.5)
  hirb (0.3.5)
  jeweler (1.5.1)
  what_methods (1.0.1)
  wirble (0.1.3)
  awesome_print (0.3.1)

Useful commands:

  • rails gems
    $ gem install rails
    
  • create rails project
    $ rails new . -d mysql -J
    
  • check Gemfile for needed gems
    $ bundle install
    
  • check DB file
cp database.yml database_example.yml
  $ cat 'db/database.yml' >> .gitignore

getting started

Scaffold: rails g scaffold Sentence text:text type:string language:string Database: rake db:migrate See all rake commands: rake -T

Rails console

  • reload!
  • _ show last result
  Sentence.find( :first)
  Sentence.first
  Sentence.find( :first, :conditions => {} )

## AEL

Sentence.first.where( :language => 'de' )
 Sentence.where( :language => 'de' ).order("RAND()").limit(1)