Rails - Feb 2008 - Adding methods to Object in Rails -- WARNING

I wanted to do:

  foo.wrap

and wrap would go to a specialized wrap for some types of foo and a
general Object#wrap for all the others.

So I added wrap to Object

class Object
  def wrap
    self
  end
end

This worked except for objects which are actually AssociationProxy
objects pretending to be some other object.  The reason is that
AssociationProxy removes all but a few methods from itself.  You will
find this line at the top of
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb

      instance_methods.each { |m| undef_method m unless m =~
/(^__|^nil\?$|^send$|proxy_)/ }

This happens before the files in initializers gets loaded.  And that is
where I added Object#wrap.  So, for a proxied object, it would call
Object#wrap instead of the specialized wrap that I had defined in my
class.

My solution to this was to do this:

module ActiveRecord
  module Associations
    class AssociationProxy
      undef_method :wrap
      undef_method :unwrap
    end
  end
end

I *think* Rails could solve this problem by hooking into
Object.method_added.  And when methods are added, the hook could undef
them for the proxy class(es).  The other choice would be to subclass
AssociationProxy from BlankSlate rather than Object -- it appears that
that is what BlankSlate is intended to do.
-- 
Posted via http://www.ruby-forum.com/.

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