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many-to-many polymorphic

March 16, 2011

I had to recently create a many to many polymorphic association.

Note that this is unique.

You can have a polymorphic association, in which, for example a comment can be applied to more than one different models. But a comment can belong to one model. two models do not have the same comment.

You can have a many to many relationship, in which an employee can have many departments and a department can have many employees.

But, this is a combination of both.

If the same comment could be applied to different models multiple times then it would be a many-to-many polymorphic association.

This blog entry helped me.

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