Django ForeignKey error: Invalid value for a to= parameter with str value

[dvndrsn]

Hey folks!

Any idea why I'm getting this error on a ForeignKey to relation with a string value? The to parameter can either be reference to the model class or a string path to resolve the model class (to avoid circular references). If I change this to value from a string to a reference to the model class itself, I no longer get the linter warning.

  $  mypy story
story/models.py:18: error: Invalid value for a to= parameter: 'Author'

This code gives me the warning from mypy:

# story/models.py
class Story(models.Model):
    ...
    author = models.ForeignKey('Author', on_delete=models.CASCADE)

If I change it to this, then there is no warning (Author model is defined in the same file):

# story/models.py
class Story(models.Model):
    ...
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

I checked the stubs for ForeignKey in this codebase and it seems to correctly indicate Union of string and model class, so I'm a little stumped as to why this problem would happen.

[mkurnikov]

Try master, I recently pushed some code addressing this problem.

[mkurnikov]

Closing issue for now, feel free to reopen if problem is still present on the latest release.