Opened 4 years ago

Closed 4 years ago

#33558 closed Bug (duplicate)

Abstract model inheriting from typing.Generic[T] causes TypeError

Reported by: Rob Percival Owned by: nobody
Component: Database layer (models, ORM) Version: 4.0
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

The exception message is "TypeError: Cannot inherit from plain Generic". Example:

T = typing.TypeVar("T")

class AbstractModel(models.Model, Generic[T]):
    foo: T  # Bad example of how you might use a TypeVar

    class Meta:
        abstract = True

class IntModel(AbstractModel[int]):
    …

A better explanation of the issue and a patch can be found here: ​https://github.com/typeddjango/django-stubs/issues/299

Change History (1)

comment:1 by Mariusz Felisiak, 4 years ago

Resolution: → duplicate
Status: new → closed

Duplicate #33174.

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