Cosillas no vistas anteriormente

Rails 3

* 2010_06_26 - Cosillas Raras de Arel - https://rails.lighthouseapp.com/projects/8994/tickets/4841-multiple-select-only-keep-the-last-one
  - Si usas varios select separados se concatenan Post.select("title").select("autor")
  - Si usas varios order seaparados se concatenan Post.order("title").order("autor")
  - Puedes utilizar reorder para sobreescribier Post.order("title").reorder("autor")
* 2010_06_09 - Al pareacer en i18n si se necesita un string html_safe la clave debe acabar en _html o en .html ActionView::Helpers::TranslationHelper doc
* 2010_04_10 - Fuera del core los helpers que pintan los errores ahora http://github.com/rails/dyanimic_form
* 2010_04_10 - Fuera del core de rails verify (in controllers) ahora http://github.com/rails/verification

* 2010_04_05 - Added all the new HTML5 form types as individual form tag methods (search, 
url, number, etc) - http://github.com/rails/rails/commit/f8730e5ce6bba4de7639ac09c6c193458038f748#comments
  search_field - search_field_tag
  telephone_field - telephone_field_tag
  email_field - email_field_tag
 

* 2010_04_02 - Extending Relations - http://github.com/rails/rails/commit/b77dd218ce845f01753d02fcbc2605c9a5ee93e1

def test_anonymous_extension
     relation = Post.where(:author_id => 1).order('id ASC') do
       def author
         'lifo'
       end
     end
 
     assert_equal "lifo", relation.author
     assert_equal "lifo", relation.limit(1).author
   end
 
   def test_named_extension
     relation = Post.where(:author_id => 1).order('id ASC').extending(Post::NamedExtension)
     assert_equal "lifo", relation.author
     assert_equal "lifo", relation.limit(1).author
 end

* 2010_03_27 - http://github.com/rails/rails/blob/master/activerecord/lib/active_record/autosave_association.rb
  # AutoSaveAssociations
  class Post
    has_one :author, :autosave => true
  end

* 2010_03_27 - http://github.com/rails/rails/commit/faeca694b3d4afebf6b623b493e86731e773c462
  # Primary Key now supports limit
  create_table :primary_key_limit, :force => true, :id => false do |t|
    t.primary_key :id, :limit => 8	
  end

* 2010_03_27 - http://github.com/rails/rails/commit/3a875e618487a06a56f6cf912cf5440f294921cc
  # Changed behavior of touch and added touch! Originally implemented by Obie Fernandez, updated touch! to act as a thin wrapper to touch.
  product.touch! # actualiza solo si pasa las validaciones sino lanza una excepción
  product.touch # actualiza sin chequear validaciones

* 2010_03_27 - http://github.com/rails/rails/blob/3172db12e4e7f6abab8ddd25f7911d29a5b65ea0/activerecord/lib/active_record/associations.rb
  # Associations callbacks
  class Project
    has_and_belongs_to_many :developers, :after_add => :evaluate_velocity
 
    def evaluate_velocity(developer)
      ...
    end
  end
  # Possible callbacks are: +before_add+, +after_add+, +before_remove+ and +after_remove+.
  
  # Bi-directional associations
  class Dungeon < ActiveRecord::Base
      has_many :traps, :inverse_of => :dungeon
      has_one :evil_wizard, :inverse_of => :dungeon
  end

  class Trap < ActiveRecord::Base
    belongs_to :dungeon, :inverse_of => :traps
  end

  class EvilWizard < ActiveRecord::Base
    belongs_to :dungeon, :inverse_of => :evil_wizard
  end