Rails - Jun 2009 - Overrite ActiveRecord Methods in Plugin

I''m trying to write an acts_as_ plugin for my rails app, and I need to
override valid? and update_attributes.  No matter what I do, I can''t
get
it to call my plugin methods, but it will call my method_missing fine.

-from acts_as_option_record.rb
module ActsAsOptionRecord
  def self.included(base)
    base.extend ClassMethods
    base.extend InstanceMethods
  end

  module ClassMethods
    def acts_as_option_record
      include ActsAsOptionRecord::InstanceMethods
      extend ActsAsOptionRecord::ClassMethods
    end

  end

  module InstanceMethods

    def update_attributes (arguments)
      debugger
      #stuff
    end

    def valid?
      debugger
      #more stuff
    end
  end
end

-from init.rb
ActiveRecord::Base.send(:include, ActsAsOptionRecord)
-- 
Posted via http://www.ruby-forum.com/.

Never ever override basic methods, if you want to do this, what you
really need is alias_method_chain :)

Imagine that you want to do some logging before and after calling the
:update_attributes method, here''s how it would look like:

module ActsAsLoggable

    def self.included( base )

        base.send( :include, InstanceMethods )
        base.alias_method_chain :update_attributes, :acts_as_loggable

    end

    module InstanceMethods

        def update_attributes_with_acts_as_loggable( attributes )
            puts "before update attributes"
            self.update_attributes_without_acts_as_loggable( attributes )
            puts "after update attributes"
        end

    end

end


-
Maurício Linhares
http://codeshooter.wordpress.com/ | http://twitter.com/mauriciojr



On Thu, Jun 11, 2009 at 7:05 PM, Helena
Wotring<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
> I''m trying to write an acts_as_ plugin for my rails app, and I
need to
> override valid? and update_attributes.  No matter what I do, I
can''t get
> it to call my plugin methods, but it will call my method_missing fine.
>
> -from acts_as_option_record.rb
> module ActsAsOptionRecord
>  def self.included(base)
>    base.extend ClassMethods
>    base.extend InstanceMethods
>  end
>
>  module ClassMethods
>    def acts_as_option_record
>      include ActsAsOptionRecord::InstanceMethods
>      extend ActsAsOptionRecord::ClassMethods
>    end
>
>  end
>
>  module InstanceMethods
>
>    def update_attributes (arguments)
>      debugger
>      #stuff
>    end
>
>    def valid?
>      debugger
>      #more stuff
>    end
>  end
> end
>
> -from init.rb
> ActiveRecord::Base.send(:include, ActsAsOptionRecord)
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

Thanks, that''s working great.

I did have to put the alias method in my ClassMethod definition of 
acts_as_option_record to get it to load correctly for my use.


  module ClassMethods
    def acts_as_option_record
      include ActsAsOptionRecord::InstanceMethods
      extend ActsAsOptionRecord::ClassMethods
      alias_method_chain :update_attributes, :option_record
    end

  end
-- 
Posted via http://www.ruby-forum.com/.