Having trouble adding rule model mixin. -- TypeError: 'class Meta' got invalid attribute(s): rules_permissions

[cdrandin]

I have tried multiple variations for support listed at https://github.com/dfunckt/django-rules#permissions-in-models

I am not sure what I am missing.

This is my current model

class Post(UUID_PK, TimeStampedModel, RulesModelBaseMixin, PolymorphicModel):
    [...]

    class Meta:
        rules_permissions = {
            "add": rules.is_staff,
            "change": rules.is_authenticated,
        }

traceback:

Traceback (most recent call last):
  File "manage.py", line 23, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/user/project/env/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command
_line
    utility.execute()
  File "/Users/user/project/env/lib/python3.7/site-packages/django/core/management/__init__.py", line 357, in execute
    django.setup()

  File "/Users/user/project/env/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/user/project/env/lib/python3.7/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/Users/user/project/env/lib/python3.7/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/Users/user/project/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/user/project/app/posts/models.py", line 48, in <module>
    class Post(UUID_PK, TimeStampedModel, RulesModelBaseMixin, PolymorphicModel):
  File "/Users/user/project/env/lib/python3.7/site-packages/polymorphic/base.py", line 83, in __new__
    new_class = self.call_superclass_new_method(model_name, bases, attrs)
  File "/Users/user/project/env/lib/python3.7/site-packages/polymorphic/base.py", line 124, in call_superclass_new_method
    self, model_name, bases, attrs
  File "/Users/user/project/env/lib/python3.7/site-packages/django/db/models/base.py", line 117, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/Users/user/project/env/lib/python3.7/site-packages/django/db/models/base.py", line 321, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/user/project/env/lib/python3.7/site-packages/django/db/models/options.py", line 196, in contribute_to_class
    raise TypeError("'class Meta' got invalid attribute(s): %s" % ','.join(meta_attrs))
TypeError: 'class Meta' got invalid attribute(s): rules_permissions

I also tried checking django polymorphism to see if it was an issue there.

https://github.com/django-polymorphic/django-polymorphic/blob/master/polymorphic/models.py

[dfunckt]

You need to specify the custom metaclass, see that part of the README again.

[cdrandin]

@dfunckt yes I have tried that. I guess I do not understand how to set it up exactly.

I have tried multiple variations of inheriting at the class model level and meta level.

[tadeo]

Not sure about this but after reading the docs I suspect you might:

class Post(RulesModelMixin, PolymorphicModelBase, UUID_PK, TimeStampedModel):
    class Meta(RulesModelBase):

[krystofbe]

did anyone get this working? i stumbled over this problem too and can't get it working. Adding RulesModelBaseMixin to the Meta class did not solve it

[tadeo]

Did you try to adding RulesModelBase as 'metaclass' parameter as suggested in the documentation?
class MyModel(RulesModelMixin, YourBaseModel1, YourBaseModel2, Model, metaclass=RulesModelBase)
Another option I think could work is to inherit from PolymorphicModel instead of PolymorphicModelBase, and/or consider using 'polymorphic.utils.get_base_polymorphic_model(ChildModel, allow_abstract=False)' or 'polymorphic.compat.with_metaclass(meta, *bases)'.
Also, I've edited my previous comment to add another option I would try.
I hope I can bring something helpful to the table.

[SidWeng]

I solve it by:

class RulesPolyModelBase(RulesModelBaseMixin, PolymorphicModelBase):
    pass


class MyModel(RulesModelMixin, PolymorphicModel, metaclass=RulesPolyModelBase):