docs: def detect_uniqueness_error(self, exc):
          """
          Parse error, and if it describes any violations of a uniqueness constraint,
          return the corresponding fields, else None
          """
          pattern = r"(\w+) with this (\w+) already exists"
  
          fields = []
          if isinstance(exc, IntegrityError):
              return self._detect_integrity_error(exc)
          assert isinstance(exc, ValidationError), TypeError
  
          for name, err in exc.error_dict.items():
              if re.search(pattern, str(err)):
                  fields.append(name)
          return fields or None