Version:

class Module

Ruby on Rails 2.2.3

Since v2.2.3

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

Extends the module object with module and instance accessors for class attributes, just like the native attr* accessors for instance attributes.

module AppConfiguration
  mattr_accessor :google_api_key
  self.google_api_key = "123456789"

  mattr_accessor :paypal_url
  self.paypal_url = "www.sandbox.paypal.com"
end

AppConfiguration.google_api_key = "overriding the api key!"

Also, modules included into Object need to be scanned and have their instance methods removed from blank slate. In theory, modules included into Kernel would have to be removed as well, but a “feature” of Ruby prevents late includes into modules from being exposed in the first place.

Inherits from

Includes

ActiveSupport::CoreExtensions::Module

Methods (defined here)

Private methods

(1) Implementation detail — not part of the public API.

# attr_internal_ivar_name

Used by

Subclasses (1)

ActionView::Base::ProxyModule

Methods (inherited)

From ActiveSupport::CoreExtensions::Module (8)

From Object (32)

From ActionController::Caching (3)

From ActionController::Cookies (2)

# cookies
self. included

From ActionController::Flash (1)

self. included

From ActionController::HttpAuthentication::Basic::ControllerMethods (3)

From ActionController::RecordIdentifier (5)

From ActionController::RequestForgeryProtection (8)

From ActionController::Rescue (7)

From ActionController::Streaming (2)

# send_data
# send_file

From ActionController::Translation (4)

# l
# localize
# t
# translate

From ActiveRecord::Callbacks (14)

From ActiveRecord::Dirty (4)

From ActiveRecord::Locking::Pessimistic (1)

# lock!

From ActiveRecord::NamedScope (1)

self. included

From ActiveRecord::Serialization (5)

From ActiveRecord::Transactions (4)

From ActiveRecord::Validations (7)

From Benchmark (1)

self. realtime

From ActionController::Components::InstanceMethods (2)

From ActiveRecord::Locking::Optimistic::ClassMethods (7)

From ActiveRecord::NamedScope::ClassMethods (2)

# named_scope
# scopes

From ActiveRecord::Serialization::ClassMethods (1)

# json_class_name

From ActiveRecord::Validations::ClassMethods (13)

From ActiveSupport::Memoizable (1)

# memoize