Rails - Feb 2009 - has_many :through relationship in polymorphic associations

Hi,
I''m facing an issue in polymorphic associations when i try to to
:through relationship.
I''ve three models:profile,gbluser,community

profile.rb
-------------
  belongs_to :node ,:polymorphic => true
  belongs_to :community,:class_name => "community",
                        :foreign_key => "node_id",
                        :conditions => "node_type =
''community''"
  belongs_to :gblorganization,:class_name => "gblorganization",
                        :foreign_key => "node_id",
                        :conditions => "node_type =
''gblorganization''"
  has_and_belongs_to_many :gblusers

Vcgbluser.rb
------------
has_many :communities,,:through=>:profiles,:conditions =>
"profiles.node_type =
''Community''",:source=>:community

Vccommunity.rb
--------------
has_many :gblusers ,:class_name
=>"gbluser",:through=>:profiles,:conditions =>
"profiles.node_type
''Community''",:source=>:community

I''m trying to implement has_many :through relationship between
community
and users.
user has_many communities through profiles and
communities has_many users through profiles

When i''m trying to do @user.communities, the search is made not on the
mapping table between user and profiles but on the profile table itself.
Rails is searching for user_id in profiles table but i''ve
has_and_belongs_to_many between profile and user.
How to solve this problem? Am I wrong somewhere. Please guide me.
Thanks
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