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a2791f5ea2
The logic allowing UniqueConstraint(fields).validate to preserve backward compatiblity with Model.unique_error_message failed to account for cases where the constraint might not be attached to a model which is a common pattern during testing. This changes allows for arbitrary UniqueConstraint(fields) to be tested in isolation without requiring actual models backing them up. Co-authored-by: Mark G <mark.gensler@protonmail.com> Backport of 13922580cccfb9ab2922ff4943dd39da56dfbd8c from main.