Methods

Instance Public methods

config()

📝 Source code 
# File activesupport/lib/active_support/configurable.rb, line 28
      def config
        @_config ||= if respond_to?(:superclass) && superclass.respond_to?(:config)
          superclass.config.inheritable_copy
        else
          # create a new "anonymous" class that will host the compiled reader methods
          Class.new(Configuration).new
        end
      end
🔎 See on GitHub

configure()

📝 Source code 
# File activesupport/lib/active_support/configurable.rb, line 37
      def configure
        yield config
      end
🔎 See on GitHub

Instance Private methods

config_accessor(*names, instance_reader: true, instance_writer: true, instance_accessor: true)

Allows you to add shortcut so that you don't have to refer to attribute through config. Also look at the example for config to contrast.

Defines both class and instance config accessors.

class User
  include ActiveSupport::Configurable
  config_accessor :allowed_access
end

User.allowed_access # => nil
User.allowed_access = false
User.allowed_access # => false

user = User.new
user.allowed_access # => false
user.allowed_access = true
user.allowed_access # => true

User.allowed_access # => false

The attribute name must be a valid method name in Ruby.

class User
  include ActiveSupport::Configurable
  config_accessor :"1_Badname"
end
# => NameError: invalid config attribute name

To omit the instance writer method, pass instance_writer: false. To omit the instance reader method, pass instance_reader: false.

class User
  include ActiveSupport::Configurable
  config_accessor :allowed_access, instance_reader: false, instance_writer: false
end

User.allowed_access = false
User.allowed_access # => false

User.new.allowed_access = true # => NoMethodError
User.new.allowed_access        # => NoMethodError

Or pass instance_accessor: false, to omit both instance methods.

class User
  include ActiveSupport::Configurable
  config_accessor :allowed_access, instance_accessor: false
end

User.allowed_access = false
User.allowed_access # => false

User.new.allowed_access = true # => NoMethodError
User.new.allowed_access        # => NoMethodError

Also you can pass a block to set up the attribute with a default value.

class User
  include ActiveSupport::Configurable
  config_accessor :hair_colors do
    [:brown, :black, :blonde, :red]
  end
end

User.hair_colors # => [:brown, :black, :blonde, :red]
📝 Source code 
# File activesupport/lib/active_support/configurable.rb, line 107
      def config_accessor(*names, instance_reader: true, instance_writer: true, instance_accessor: true) # :doc:
        names.each do |name|
          raise NameError.new("invalid config attribute name") unless /\A[_A-Za-z]\w*\z/.match?(name)

          reader, reader_line = "def #{name}; config.#{name}; end", __LINE__
          writer, writer_line = "def #{name}=(value); config.#{name} = value; end", __LINE__

          singleton_class.class_eval reader, __FILE__, reader_line
          singleton_class.class_eval writer, __FILE__, writer_line

          if instance_accessor
            class_eval reader, __FILE__, reader_line if instance_reader
            class_eval writer, __FILE__, writer_line if instance_writer
          end
          send("#{name}=", yield) if block_given?
        end
      end
🔎 See on GitHub