require 'ostruct' module DeveloperProjectsAssociationExtension def find_most_recent order("id DESC").first end end module DeveloperProjectsAssociationExtension2 def find_least_recent order("id ASC").first end end class Developer < ActiveRecord::Base has_and_belongs_to_many :projects do def find_most_recent order("id DESC").first end end has_and_belongs_to_many :projects_extended_by_name, -> { extending(DeveloperProjectsAssociationExtension) }, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id" has_and_belongs_to_many :projects_extended_by_name_twice, -> { extending(DeveloperProjectsAssociationExtension, DeveloperProjectsAssociationExtension2) }, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id" has_and_belongs_to_many :projects_extended_by_name_and_block, -> { extending(DeveloperProjectsAssociationExtension) }, :class_name => "Project", :join_table => "developers_projects", :association_foreign_key => "project_id" do def find_least_recent order("id ASC").first end end has_and_belongs_to_many :special_projects, :join_table => 'developers_projects', :association_foreign_key => 'project_id' has_many :audit_logs scope :jamises, -> { where(: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 after_find :track_instance_count cattr_accessor :instance_count def track_instance_count self.class.instance_count ||= 0 self.class.instance_count += 1 end private :track_instance_count 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 DeveloperWithSelect < ActiveRecord::Base self.table_name = 'developers' default_scope { select('name') } end class DeveloperWithIncludes < ActiveRecord::Base self.table_name = 'developers' has_many :audit_logs, :foreign_key => :developer_id default_scope { includes(:audit_logs) } end class DeveloperOrderedBySalary < ActiveRecord::Base self.table_name = 'developers' default_scope { order('salary DESC') } scope :by_name, -> { order('name DESC') } end class DeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' default_scope { where("name = 'David'") } end class LazyLambdaDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' default_scope lambda { where(:name => 'David') } end class LazyBlockDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' default_scope { where(:name => 'David') } end class CallableDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' default_scope OpenStruct.new(:call => where(:name => 'David')) end class ClassMethodDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' def self.default_scope where(:name => 'David') end end class ClassMethodReferencingScopeDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' scope :david, -> { where(:name => 'David') } def self.default_scope david end end class LazyBlockReferencingScopeDeveloperCalledDavid < ActiveRecord::Base self.table_name = 'developers' scope :david, -> { where(:name => 'David') } default_scope { david } 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' default_scope -> { where(:salary => 50000) } end class MultiplePoorDeveloperCalledJamis < ActiveRecord::Base self.table_name = 'developers' default_scope -> { where(:name => 'Jamis') } default_scope -> { where(:salary => 50000) } end module SalaryDefaultScope extend ActiveSupport::Concern included { default_scope { where(:salary => 50000) } } end class ModuleIncludedPoorDeveloperCalledJamis < DeveloperCalledJamis self.table_name = 'developers' include SalaryDefaultScope end class EagerDeveloperWithDefaultScope < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, -> { order('projects.id') }, :foreign_key => 'developer_id', :join_table => 'developers_projects' default_scope { includes(:projects) } end class EagerDeveloperWithClassMethodDefaultScope < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, -> { order('projects.id') }, :foreign_key => 'developer_id', :join_table => 'developers_projects' def self.default_scope includes(:projects) end end class EagerDeveloperWithLambdaDefaultScope < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, -> { order('projects.id') }, :foreign_key => 'developer_id', :join_table => 'developers_projects' default_scope lambda { includes(:projects) } end class EagerDeveloperWithBlockDefaultScope < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, -> { order('projects.id') }, :foreign_key => 'developer_id', :join_table => 'developers_projects' default_scope { includes(:projects) } end class EagerDeveloperWithCallableDefaultScope < ActiveRecord::Base self.table_name = 'developers' has_and_belongs_to_many :projects, -> { order('projects.id') }, :foreign_key => 'developer_id', :join_table => 'developers_projects' default_scope OpenStruct.new(:call => includes(:projects)) end class ThreadsafeDeveloper < ActiveRecord::Base self.table_name = 'developers' def self.default_scope sleep 0.05 if Thread.current[:long_default_scope] limit(1) end end class CachedDeveloper < ActiveRecord::Base self.table_name = "developers" self.cache_timestamp_format = :number end