Patch for review: make :delete_all on has_many with :primary_key not delete unrelated records

Just what the subject says - on 2-3-stable, destroying an object with a has_many association using :primary_key and :delete_all will try to match records against the destroyed record's primary key rather than that declared in the association. Could cause data loss in some circumstances.

Patch is tiny - one line + some support functions, and includes a test.


--Matt Jones

Bump. Worth a look as this is a data corruption situation...