I have a blog with categories.  Users who read the blog are allowed to
add up to five unique posts to their favorites for each category.

So

Favorites
- CategoryID
- PostID
- UserID

How should I limit the number of favorites per user (per category),
while enforcing favorite post uniqueness for each category?  (if that
sentence made any sense at all).

Is this something that should be down as a Trigger in PostgreSQL, is
this something that should be done by overriding save(), or is this
limitation/restriction suppose to be handled just in the view?


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