Rails - Apr 2006 - has_many :trough with 2x the same table

I have a site where Users can become Friends with other Users. I used to do this
with a habtm, but of course I want to stay up-to-date and convert this to a
has_many :trough. Unfortunately I can''t get it to work.. the
documentation on this feature is a bit sparse at the moment.

This is my old habtm:

has_and_belongs_to_many :friends, :join_table =>
''user_friends'', :foreign_key =>
''user_id'', :association_foreign_key =>
''friend_id'', :class_name => ''Person''

I''ve tried various things, but I''m completely lost now. I
looked at the :source option, but that doesn''t allow me to do this and
the :class_name parameter doesn''t seem to work either. Any hints?

Martijn wrote:
> I have a site where Users can become Friends with other Users. I used to 
> do this with a habtm, but of course I want to stay up-to-date and 
> convert this to a has_many :trough. Unfortunately I can''t get it
to
> work.. the documentation on this feature is a bit sparse at the moment.
> 
> This is my old habtm:
> 
> has_and_belongs_to_many :friends, :join_table =>
''user_friends'',
> :foreign_key => ''user_id'', :association_foreign_key
=> ''friend_id'',
> :class_name => ''Person''
> 
> I''ve tried various things, but I''m completely lost now. I
looked at the
> :source option, but that doesn''t allow me to do this and the
:class_name
> parameter doesn''t seem to work either. Any hints?
Maybe I''m wrong about this, but the point of :through is not to replace
HABTM.  You use it when your join table represents a different class 
that has its own ID and attributes.   If your join table is just a join 
table (2 ids which are foreign keys to the other 2 tables) then stick to 
HABTM.

Dan


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