moiristo/deep_cloneable — pull request #18 by camertron (2013-01-31 06:09:42+00:00)
Title: Fixing primary key assignment for habtm association

Looks like `deep_cloneable` is treating a HABTM relationship the same as a has_many relationship, which results in an exception because `deep_cloneable` tries to assign the primary key of the cloned object. HABTM relationships use join tables, so assigning a primary key doesn't work. This PR just makes sure the cloned object responds to the call to `#{primary_key}=` before calling it.