Rails - Jan 2007 - [:year, :month, :day].each { |m| delegate m, :to => :published_at }

Given below is a model from mephisto blogging tool.

class Content < ActiveRecord::Base
  filtered_column :body, :excerpt
  belongs_to :user, :with_deleted => true
  belongs_to :site
  [:year, :month, :day].each { |m| delegate m, :to => :published_at }
end

I couldn''t understand the last line.

Anyone care to explain what''s happening in the last line.

Thanks.
- Neeraj

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This is the quick way of writing the following:

  def year
    published_at.year
  end

  def year=(y)
    published_at.year = y
  end

  # Same for month and day

The ''delegate'' method allows you to delegate a member access
to a
member with the same name on a different member object, so you can
avoid writing ''content.published_at.year''


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Thanks, Tom, that''s really handy.

I was wondering where this ''delegate'' method is defined, so I
looked
it up and found it in ActiveSupport--it''s a method defined in the  
Module class.  Pretty tricky :)

Available here, if anyone else is interested:
   activesupport/lib/active_support/core_ext/module/delegation.rb

Duane Johnson
(canadaduane)
http://blog.inquirylabs.com/


On Jan 1, 2007, at 12:52 AM, Tom Fakes wrote:
>
> This is the quick way of writing the following:
>
>  def year
>    published_at.year
>  end
>
>  def year=(y)
>    published_at.year = y
>  end
>
>  # Same for month and day
>
> The ''delegate'' method allows you to delegate a member
access to a
> member with the same name on a different member object, so you can
> avoid writing ''content.published_at.year''
>
>
> >

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