Hi, I'm looking at IS_IN_DB and IS_NOT_IN_DB to filter out inserts and want to know if it's possible to use 2 fields to validate an insert to prevent duplicates. For example, let's say I want emails to be unique in email field, now I want it to be email AND postalcode to be unique. I would like to use this at the model level and not a controller, is this possible?
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