module DeveloperProjectsAssociationExtension def find_most_recent find(:first, :order => "id DESC") end end module DeveloperProjectsAssociationExtension2 def find_least_recent find(:first, :order => "id ASC") end end class Developer < ActiveRecord::Base has_and_belongs_to_many :projects do def find_most_recent find(:first, :order => "id DESC") end end has_and_belongs_to_many :projects_extended_by_name, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id", :extend => DeveloperProjectsAssociationExtension has_and_belongs_to_many :projects_extended_by_name_twice, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id", :extend => [DeveloperProjectsAssociationExtension, DeveloperProjectsAssociationExtension2] has_and_belongs_to_many :projects_extended_by_name_and_block, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id", :extend => DeveloperProjectsAssociationExtension do def find_least_recent find(:first, :order => "id ASC") end end has_and_belongs_to_many :special_projects, :join_table => 'developers_projects', :association_foreign_key => 'project_id' has_many :audit_logs scope :jamises, :conditions => {:name => 'Jamis'} validates_inclusion_of :salary, :in => 50000..200000 validates_length_of :name, :within => 3..20 before_create do |developer| developer.audit_logs.build :message => "Computer created" end def log=(message) audit_logs.build :message => message end def self.all_johns self.with_exclusive_scope :find => where(:name => 'John') do self.all end end end class AuditLog < ActiveRecord::Base belongs_to :developer, :validate => true belongs_to :unvalidated_developer, :class_name => 'Developer' end DeveloperSalary = Struct.new(:amount) class DeveloperWithAggregate < ActiveRecord::Base self.table_name = 'developers' composed_of :salary, :class_name => 'DeveloperSalary', :mapping => [%w(salary amount)] end class DeveloperWithBeforeDestroyRaise < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, :join_table => 'developers_projects', :foreign_key => 'developer_id' before_destroy :raise_if_projects_empty! def raise_if_projects_empty! raise if projects.empty? end end class DeveloperOrderedBySalary < ActiveRecord::Base self.table_name = 'developers' default_scope :order => 'salary DESC' scope :by_name, order('name DESC') def self.all_ordered_by_name with_scope(:find => { :order => 'name DESC' }) do find(:all) end end end class DeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' default_scope where("name = 'David'") end class ClassMethodDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' def self.default_scope where(:name => 'David') end end class DeveloperCalledJamis < ActiveRecord::Base self.table_name = 'developers' default_scope where(:name => 'Jamis') scope :poor, where('salary < 150000') end class PoorDeveloperCalledJamis < ActiveRecord::Base self.table_name = 'developers' default_scope where(:name => 'Jamis', :salary => 50000) end class InheritedPoorDeveloperCalledJamis < DeveloperCalledJamis self.table_name = 'developers' ActiveSupport::Deprecation.silence do default_scope where(:salary => 50000) end end class MultiplePoorDeveloperCalledJamis < ActiveRecord::Base self.table_name = 'developers' default_scope where(:name => 'Jamis') ActiveSupport::Deprecation.silence do default_scope where(:salary => 50000) end end