[Rails] How can I overwrite the parent.children.push(child) Method?

[Alex Young]

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