Method: Module#initializer

Defined in:

lib/quality_extensions/module/initializer.rb

#initializer(*attributes, &block) ⇒ Object

Automatically create an initializer assigning the given arguments.

class MyClass
  initializer(:a, "b", :c)
end

_is equivalent to_

class MyClass
  def initialize(a, b, c)
    @a,@b,@c = a,b,c
  end
end

Downside: Initializers defined like this can’t take blocks. This can be fixed when Ruby 1.9 is out.

The initializer will not raise an Exception when the user does not supply a value for each instance variable. In that case it will just set the instance variable to nil. You can assign default values or raise an Exception in the block.

# File 'lib/quality_extensions/module/initializer.rb', line 34

def initializer(*attributes, &block)
  define_method(:initialize) do |*args|
    attributes.zip(args) do |sym, value|
      instance_variable_set("@#{sym}", value)
    end

    instance_eval(&block) if block
  end
end