Class: Module

Inherits:
Object
  • Object
show all
Defined in:
lib/core_ext/module.rb

Overview

activesupport/lib/active_support/core_ext/module/attribute_accessors.rb

Instance Method Summary collapse

Instance Method Details

#mattr_accessor(*syms) ⇒ Object

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!"

To opt out of the instance writer method, pass :instance_writer => false. To opt out of the instance reader method, pass :instance_reader => false. To opt out of both instance methods, pass :instance_accessor => false.



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# File 'lib/core_ext/module.rb', line 59

def mattr_accessor(*syms)
  mattr_reader(*syms)
  mattr_writer(*syms)
end

#mattr_reader(*syms) ⇒ Object 



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# File 'lib/core_ext/module.rb', line 3

def mattr_reader(*syms)
  options = syms.extract_options!
  syms.each do |sym|
    class_eval("      @@\#{sym} = nil unless defined? @@\#{sym}\n\n      def self.\#{sym}\n        @@\#{sym}\n      end\n    EOS\n\n    unless options[:instance_reader] == false || options[:instance_accessor] == false\n      class_eval(<<-EOS, __FILE__, __LINE__ + 1)\n        def \#{sym}\n          @@\#{sym}\n        end\n      EOS\n    end\n  end\nend\n", __FILE__, __LINE__ + 1)

#mattr_writer(*syms) ⇒ Object 



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# File 'lib/core_ext/module.rb', line 24

def mattr_writer(*syms)
  options = syms.extract_options!
  syms.each do |sym|
    class_eval("      def self.\#{sym}=(obj)\n        @@\#{sym} = obj\n      end\n    EOS\n\n    unless options[:instance_writer] == false || options[:instance_accessor] == false\n      class_eval(<<-EOS, __FILE__, __LINE__ + 1)\n        def \#{sym}=(obj)\n          @@\#{sym} = obj\n        end\n      EOS\n    end\n  end\nend\n", __FILE__, __LINE__ + 1)