How can uniqueness validated on a HABTM association?
A User can be on many Teams and Many Teams can have a User. But how do you stop a user added to the same team twice?
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How can uniqueness validated on a HABTM association?
A User can be on many Teams and Many Teams can have a User. But how do you stop a user added to the same team twice?
Well in the DB, you do this by putting a unique constraint on the {user, team} tuple in your join table