Module: Pickle::Injector

Defined in:
lib/pickle/injector.rb

Class Method Summary collapse

Class Method Details

.inject(delegate_class, options = {}) ⇒ Object 



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# File 'lib/pickle/injector.rb', line 3

def self.inject(delegate_class, options = {})
  target_class  = options[:into] || raise('inject requires a target class specified with :into')
  delegate_name = options[:name] || delegate_class.name.underscore.gsub('/','_')
  init_delegate = options[:init] || lambda { new }
  
  # create a session object on demand (in target)
  target_class.send(:define_method, delegate_name) do
    instance_variable_get("@#{delegate_name}") || instance_variable_set("@#{delegate_name}", delegate_class.instance_eval(&init_delegate))
  end
  
  # in the target, delegate the public instance methods of delegate_class to the delegate_name method
  delegate_methods = delegate_class.public_instance_methods - Object.instance_methods
  target_class.delegate *(delegate_methods + [{:to => delegate_name}])
end