Allow use of expressions in Model.objects.create()

[Joey Wilhelm]

I have a case where I need to assign a field value from the return of a database function, but I do not want to set a default for the field.

Currently, the following will work:

from django.db.models.expressions import Func

from .models import MyModel

instance = MyModel.objects.create(
    ...
)
instance.code = Func(*my_args, function='generate_unique_code')
instance.save(update_fields=['code'])

However, the following:

from django.db.models.expressions import Func

from .models import MyModel

instance = MyModel.objects.create(
    ...,
    code=Func(*my_args, function='generate_unique_code')
)

produces TypeError: int() argument must be a string, a bytes-like object or a number, not 'Func'

I would expect that these two methods for assigning the value should behave similarly.

[Tim Graham]

Duplicate of #24509.