Getting "doesn't Exist Or Is M2m Field" Error On My Uuid (primary Key) When Trying To Save In Drf

I've written my own bulk save() because I can't get the internal save() method of ListSerializer to call the relevant method (create() & update()) depending on the query payloa

Solution 1:

The error comes from this line where Django compares update_fields you've provided with Model fields.

        if non_model_fields:
            raise ValueError("The following fields do not exist in this ""model or are m2m fields: %s"
                             % ', '.join(non_model_fields))

Unfortunately the error message is a little misleading because all fields with primary_key=True (like your uuid field) are filtered out, beside m2m ones.

        update_fields = frozenset(update_fields)
        field_names = set()

        for field in self._meta.fields:
            ifnot field.primary_key:
                field_names.add(field.name)
                ...
        non_model_fields = update_fields.difference(field_names)

That's the reason why non_model_fields are not empty and exception is raised.

To fix your problem, you need to get rid of uuid key from obj before saving.

        ...
        obj.pop('uuid')  # only if mutating validated_data doesn't bother you

        update_fields = [k for k,v in obj.items()]
        for k, v in obj.items():
            setattr(instance, k, v)
        instance.save(update_fields=update_fields)
        result.append(instance)

BTW you don't need this list comprehension to get update_fields - you can use obj.keys() which gives same result.

Solution 2:

Happens due to wrong field name(column name) use in django