ActiveRecord model inheritance support by module. Fix inner module association and single table inheritance.
Add this line to your application's Gemfile:
gem 'active_modularity'
And then execute:
$ bundle
Or install it yourself as:
$ gem install active_modularity
# config/initializers/acts_as_modurarity.rb
# enable active modurality
ActiveRecord::Base.acts_as_modurality
# load all files (Must be loaded the models and controllers.)
YourApp::Application.eager_load! unless Rails.configuration.cache_classes
#
# has many association
#
# app/models/user.rb
class Person < ActiveRecord::Base
has_many :entries
end
# app/models/entry.rb
class Entry < ActiveRecord::Base
belongs_to :person
end
# app/models/admin/user.rb
module Admin
class Person < ::Person
end
end
# app/models/admin/user.rb
module Admin
class Entry < ::Entry
end
end
# standard association
person = Person.create
person.entries.build.class.name # Entry
# inner module association
admin_person = Admin::Person.create
admin_person.entries.build.class.name # Admin::Entry
#
# single table inheritance
#
# app/models/person.rb
class Person < ActiveRecord::Base
end
# app/models/customer.rb
class Customer < Person
end
# app/models/employee.rb
class Employee < Person
end
# app/models/admin/person.rb
module Admin
class Person < ::Person
module Common
extend ActiveSupport::Concern
included do
# Admin::Person common class macro
validates :name, :presence => true
end
def common_method
# do something...
end
end
end
end
# app/models/admin/customer.rb
module Admin
class Customer < ::Customer
include Admin::Person::Common
end
end
# app/models/admin/employee.rb
module Admin
class Employee < ::Employee
include Admin::Person::Common
end
end
# create
alice = Customer.create(:name => "alice")
alice.class.name # Customer
alice.type # Customer
bob = Admin::Customer.create(:name => "bob")
bob.class.name # Admin::Customer
bob.type # Customer (not Admin::Customer)
# find
Person.find(alice.id).class.name # Customer
Person.find(bob.id ).class.name # Customer
Admin::Person.find(alice.id).class.name # Admin::Customer
Admin::Person.find(bob.id ).class.name # Admin::Customer
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request