Module: DeferedDelegator

Included in:
Binder::AR
Defined in:
lib/defered_delegator.rb

Overview

Private: A simple module that delegates classes methods when needed, keeping the calls in memory.

Examples

class Foo
def self.foo arg
  "World of #{arg}"
end
#
def self.bar
  "Hello"
end
end

class Baz
extend DeferedDelegator
register_delegators :bar, :foo
#
def initialize obj
  @obj = obj
end
#
def foobar
  delegate_to @obj
end
end

class Bar < Baz
foo "Foo"
bar
end

Bar.new Foo
Bar.foobar
# => "World of Foo"
# => "Hello"

Instance Method Summary collapse

Instance Method Details

#delegate_to(klass_or_object) ⇒ Object

Public: Triggers the delegation and run the delegated methods

klass_or_object - A Class or an Object to delegate to.

Returns Nothing.



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# File 'lib/defered_delegator.rb', line 60

def delegate_to klass_or_object
  @delegators.each do |data|
    unless data.empty?
      name = data[:name]
      args = data[:params]
      klass_or_object.send(name, *args)
    end
  end
end

#register_delegators(*args) ⇒ Object

Public: Allows to register delegators

args - List of Symbols, the method name that will be delegated.

Returns Nothing.



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# File 'lib/defered_delegator.rb', line 43

def register_delegators *args
  args.each do |delegator|
    delegator = delegator.to_s
    module_eval %Q{
      def self.#{delegator} *parameters
        @delegators ||= []
        @delegators << { name: :#{delegator}, params: parameters }
      end
    }
  end
end