I have a table called comment_ratings where users can rate comments up
or down. It looks like this:
TABLE: comment_ratings
id => INT
rating_value => TINYINT
comment_id => INT
user_id => INT
created => DATETIME
modified => DATETIME
Users should only be allowed one vote on each comment, so I have
created a unique key on two fields, comment_id and user_id. The name
of the key is unique_rating_per_user. This works fine in my database,
but how can I add the unique validation to the CommentRating model?
As far as I know, isUnique only handles one field.
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