django/db/models/base.py:102

gistfile1.py

def full_clean(self, exclude=None, validate_unique=True):
        """
        Calls clean_fields, clean, and validate_unique, on the model,
        and raises a ``ValidationError`` for any errors that occurred.
        """
        errors = {}
        if exclude is None:
            exclude = []
        else:
            exclude = list(exclude)

        try:
            self.clean_fields(exclude=exclude)
        except ValidationError as e:
            errors = e.update_error_dict(errors)

        # Form.clean() is run even if other validation fails, so do the
        # same with Model.clean() for consistency.
        try:
            self.clean()
        except ValidationError as e:
            errors = e.update_error_dict(errors)

        # Run unique checks, but only for fields that passed validation.
        if validate_unique:
            for name in errors.keys():
                if name != NON_FIELD_ERRORS and name not in exclude:
                    exclude.append(name)
            try:
                self.validate_unique(exclude=exclude)
            except ValidationError as e:
                errors = e.update_error_dict(errors)

        if errors:
            raise ValidationError(errors)