Rails - Jan 2006 - Many to Many relationship - trys to destroy twice??

I''m trying to work with a many to many relationship but since my join 
table need additional attributes I can''t use habtm.

When I attempt to destroy an item from the join table RoR appears to 
attempt to destroy the item twice.  Here is an example from the log file 
showing the process.  The record is identified using a find_by_sql using 
the two id parameters (and a third ''position'' parameter for
safety).
The item is then apparently sucessfully destroyed, and the controller 
redirects to ''show_p''.  Then it all goes wrong, and it appears
to try to
find the same record again.

Has anyone seen this before?

cheers

Neale

Processing AdminController#delete_i (for 127.0.0.1 at 2006-01-02 
22:14:12) [POST]
  Parameters: {"pid"=>"2",
"commit"=>"Delete",
"action"=>"delete_i",
"controller"=>"admin",
"ingredient"=>{"ingredient_id"=>"64",
"position"=>"8"}}
  Ingredients_Product Load (0.002288)   SELECT * FROM 
ingredients_products WHERE (product_id = ''2'' and ingredient_id
= ''64''
and position = ''8'') LIMIT 1
  SQL (0.000563)   BEGIN
  Ingredients_Product Columns (0.013075)   SHOW FIELDS FROM 
ingredients_products
  Ingredients_Product Destroy (0.002416)    DELETE FROM 
ingredients_products
 WHERE id = 50

  SQL (0.001618)   COMMIT
Redirected to http://localhost:3000show_p
Completed in 0.02861 (34 reqs/sec) | DB: 0.01996 (69%) | 302 Found 
[http://localhost/admin/delete_i?pid=2]


Processing AdminController#delete_i (for 127.0.0.1 at 2006-01-02 
22:14:12) [POST]
  Parameters: {"pid"=>"2",
"commit"=>"Delete",
"action"=>"delete_i",
"controller"=>"admin",
"ingredient"=>{"ingredient_id"=>"64",
"position"=>"8"}}
  Ingredients_Product Load (0.004203)   SELECT * FROM 
ingredients_products WHERE (product_id = ''2'' and ingredient_id
= ''64''
and position = ''8'') LIMIT 1


NoMethodError (You have a nil object when you didn''t expect it!

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