ModelForm fields' non-uniqueness errors aren't customizable
|Reported by:||teolicy||Owned by:||nobody|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
Changing error messages is done by passing the error_messages dict to the field's constructor. It seems that ModelForm fields that have unique=True in their Model field are not overridable using error_messages.