Rails - Jan 2006 - How can I overwrite the parent.children.push(child) Method?

Hi all

I want to overwrite the push method (which is an alias of <<, the same 
as concat) of collections, and there I want to test if :uniq is set to 
true in the relationship. If so, the method should check if the passed 
object is already related to the parent, or not (only then it will be 
added).

But I just can''t find the original code of this method, so I could 
overwrite it... Can anyone tell me? Thanks. :-)

Greets
Josh

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Joshua Muheim wrote:
> Hi all
> 
> I want to overwrite the push method (which is an alias of <<, the
same
> as concat) of collections, and there I want to test if :uniq is set to 
> true in the relationship. If so, the method should check if the passed 
> object is already related to the parent, or not (only then it will be 
> added).
> 
> But I just can''t find the original code of this method, so I could
> overwrite it... Can anyone tell me? Thanks. :-)
activerecord-1.13.2\lib\active_record\associations\association_collection.rb 

has:

module ActiveRecord
   module Associations
     class AssociationCollection < AssociationProxy #:nodoc:
...
       def <<(*records)
         result = true
         load_target
         @owner.transaction do
           flatten_deeper(records).each do |record|
             raise_on_type_mismatch(record)
             callback(:before_add, record)
             result &&= insert_record(record) unless @owner.new_record?
             @target << record
             callback(:after_add, record)
           end
         end
				
         result and self
       end

       alias_method :push, :<<


But I''d think you''re better off not overriding that.  Better
to have a
wrapper method in the parent class.

-- 
Alex

Thanks a lot. But I don''t really get what to do now. ;-)

module ActiveRecord
  module Associations
    class AssociationCollection < AssociationProxy #:nodoc:
      def push_uniq(record)
        # what to do here?
      end
    end
  end
end

I''m quite confused with Rails'' internal codes... Where do I
get the
already associated objects'' array from so I can check if the param 
record is already incliuded in it?
Btw at the moment I only get a

ArgumentError: wrong number of arguments (1 for 0)

when I use Members.find(1).disc_jockeys.push_uniq(DiscJockey.find(1))

Why that?

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