Inheritance module_eval

Allows to create methods with same name inside particular class/object by pushing them down by inheritance tree.
So method "field" may call other "field" in same class by calling super keyword instead of just redefine it.

Installation

gem install inheritance_module_eval

Usage

Inheritance module_eval provides 2 methods for eval instance and class methods:

• instance_eval_on

• class_eval_on

  InheritanceModuleEval.instance_eval_on(instance_object, code = nil, &block) #method used to eval instance methods (ie: methods of an object) InheritanceModuleEval.class_eval_on(class_object, code = nil, &block) #method used to eval class methods (ie: methods of an class)

Note: you may include

require "inheritance_module_eval/integration"

to intergate inheritance_module_eval in ruby core. That will give 2 methods:

• instance_module_eval(code = nil, &block)
• class_module_eval(code = nil, &block)

Below is some simple example of inheritance_module_eval usage:

require 'inheritance_module_eval'
require "inheritance_module_eval/integration"

# Some dummy class that uses #instance_module_eval
class Content
  # defines simple getter and setter
  self.field(name)
    instance_module_eval %{
      def #{name}
        @#{name}
      end

      def #{name}=(new_value)
        @#{name}= new_value
      end
    }
    end
  end
end


class Article < Content
  field :title
  field :content
  field :etc

  # you desided, that title for article should be titelized
  # from now you dont need to call alias_method or reimplement method anymore!
  # you can use inheritance!
  # make it simple
  def title
    super.to_s.titelize
  end
end

Requirements

none

rspec2 for testing

Compatibility

tested with Ruby

• 1.8.7
• 1.9.2
• 1.9.3
• jruby-19mode
• jruby-18mode
• rbx-19mode
• rbx-18mode
• ruby-head
• ree

see build history

Contributing

see contributing guide

Copyright

Copyright © 2011-2012 Alexander N Paramonov. Released under the MIT License. See the LICENSE file for further details.