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# A typical module looks like this
#
# module M
# def self.included(base)
# base.send(:extend, ClassMethods)
# base.send(:include, InstanceMethods)
# scope :foo, :conditions => { :created_at => nil }
# end
#
# module ClassMethods
# def cm; puts 'I am a class method'; end
# end
#
# module InstanceMethods
# def im; puts 'I am an instance method'; end
# end
# end
#
# By using <tt>ActiveSupport::Concern</tt> the above module could instead be written as:
#
# module M
# extend ActiveSupport::Concern
#
# included do
# scope :foo, :conditions => { :created_at => nil }
# end
#
# module ClassMethods
# def cm; puts 'I am a class method'; end
# end
#
# module InstanceMethods
# def im; puts 'I am an instance method'; end
# end
# end
module ActiveSupport
module Concern
def self.extended(base)
base.instance_variable_set("@_dependencies", [])
end
def append_features(base)
if base.instance_variable_defined?("@_dependencies")
base.instance_variable_get("@_dependencies") << self
return false
else
return false if base < self
@_dependencies.each { |dep| base.send(:include, dep) }
super
base.extend const_get("ClassMethods") if const_defined?("ClassMethods")
base.send :include, const_get("InstanceMethods") if const_defined?("InstanceMethods")
base.class_eval(&@_included_block) if instance_variable_defined?("@_included_block")
end
end
def included(base = nil, &block)
if base.nil?
@_included_block = block
else
super
end
end
end
end
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