ActiveRecord HasAndBelongsToManyAssociationWithPrimaryKeyError

rubyonrails-talk
1

Im trying to upgrade an app from rails 2.3 to rails 3.0

I get the following error in rails 3.0.6 environment

Error message:     Primary key is not allowed in a has_and_belongs_to_many join table (appointment_label). (ActiveRecord::HasAndBelongsToManyAssociationWithPrimaryKeyError)

Exception class:     ActiveRecord::HasAndBelongsToManyAssociationWithPrimaryKeyError

seems primary key should be removed from "appointment_label" so I removed the primary key column and it did worked PERFECT!!

But what I don't get is the app worked fine in rails 2.3 environment even with primary key in the table "appointment_label" but not in rails 3.0.6 environment ???

2

Presumably it did not matter that the table had a primary key in the earlier version (even though it was not necessary). In Rails 3 they have made it an error.

Colin