Module: DSLKit::Delegate

Included in:
Module
Defined in:
lib/dslkit/polite.rb

Overview

This module can be included into modules/classes to make the delegate method available.

Instance Method Summary collapse

Instance Method Details

#delegate(method_name, obj, other_method_name = method_name) ⇒ Object

A method to easily delegate methods to an object, stored in an instance variable or returned by a method call.

It’s used like this:

class A
  delegate :method_here, :@obj, :method_there
end

or:

class A
  delegate :method_here, :method_call, :method_there
end

other_method_name defaults to method_name, if it wasn’t given.

Raises:

  • (ArgumentError) 


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# File 'lib/dslkit/polite.rb', line 531

def delegate(method_name, obj, other_method_name = method_name)
  raise ArgumentError, "obj wasn't defined" unless obj
=begin
1.9 only:
  define_method(method_name) do |*args, &block|
    instance_variable_get(obj).__send__(other_method_name, *args, &block)
  end
=end
  obj = obj.to_s
  if obj[0] == ?@
    class_eval <<-EOS
      def #{method_name}(*args, &block)
        instance_variable_get('#{obj}').__send__(
          '#{other_method_name}', *args, &block)
      end
    EOS
  else
    class_eval <<-EOS
      def #{method_name}(*args, &block)
        __send__('#{obj}').__send__(
          '#{other_method_name}', *args, &block)
      end
    EOS
  end
end