Yuki Iida semind

## rails_cheatsheet.md

      
        
          
            
              
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                azinazadi
                / rails_cheatsheet.md
            
            
              Created
              November 17, 2011 11:21
                — forked from taktran/rails_cheatsheet.md
            
              
                Rails cheatsheet
              
          
        
      
        
  
      
    An incomplete cheatsheet for rails 3. Things are added as they are required.
Active Record validations

# http://guides.rubyonrails.org/active_record_validations_callbacks.html

class SomeClass < ActiveRecord::Base

  # length