[BUG] Not able to use abstract model to generate an inheritable schema: AttributeError: 'str' object has no attribute '_meta'

[Bishwas-py]

I wanted to generate an inheritable model schema for an abstract model ContentGenericModel, which seems to be not possible at the moment.

class ContentGenericModel(WordPressActionsModel, GenericModel, OpenAIModel, ContentGenerationModel):
    title = models.CharField(max_length=11000)
    user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    slug = models.SlugField(max_length=11000, blank=True, null=True)
    uuid = models.UUIDField(editable=False, default=uuid.uuid4)
    ai_title = models.CharField(max_length=11000, blank=True, null=True)
    # .... other fields

    class Meta:
        abstract = True

class WriterContentSchema(ModelSchema):
    wordpress_post: WordPressContentSchema | None
    credits_consumed: list[CreditUsageSchema]
    sub_keywords: list[KeywordSchema]
    associated_wp_site: WordPressSiteSchema | None

    class Config:
        model = ContentGenericModel
        model_fields = [
            "uuid",
            "title",
            "ai_title",
            "newly_created",
            "html_text",
            # other fields
        ]

I am getting following issues:

  File "/home/codie/Projects/blogstorm.ai/backend_blogstorm/writer/schemas/__init__.py", line 15, in <module>
    class WriterContentSchema(ModelSchema):
  File "/home/codie/Projects/blogstorm.ai/backend_blogstorm/venv/lib/python3.11/site-packages/ninja/orm/metaclass.py", line 63, in __new__
    model_schema = create_schema(
                   ^^^^^^^^^^^^^^
  File "/home/codie/Projects/blogstorm.ai/backend_blogstorm/venv/lib/python3.11/site-packages/ninja/orm/factory.py", line 59, in create_schema
    python_type, field_info = get_schema_field(fld, depth=depth)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/codie/Projects/blogstorm.ai/backend_blogstorm/venv/lib/python3.11/site-packages/ninja/orm/fields.py", line 118, in get_schema_field
    internal_type = field.related_model._meta.pk.get_internal_type()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute '_meta'

Note: It works super well when I change the model to something that is not an abstract model and is inherited from ContentGenericModel.

Versions (please complete the following information):

• Python version: 3.11.2
• Django version: 4.1.6
• Django-Ninja version: 0.22.2
• Pydantic version: 1.10.13

[Bishwas-py]

Currently, I am using hand-written manual schema for the purpose of being fulfilled. I am sorry, if that's what we are meant to do, I am okay with that :)

[vitalik]

well the error is due to the fact that your model is abstract (currently it's not supported)

I guess what you can do meanwhile - create a real model inherited from it (but make it managed=False - that way it will not create a table in your db)

[Bishwas-py]

well the error is due to the fact that your model is abstract (currently it's not supported)

I guess what you can do meanwhile - create a real model inherited from it (but make it managed=False - that way it will not create a table in your db)

I just wrote the required schema. Thanks :)