`TypeError: Widget.__init__() got an unexpected keyword argument 'allow_blank'` about django-import-export HOT 4 CLOSED

Great - thanks for confirming.

from django-import-export.

Are you using v4.0.3? Are you using any third party plugins?

from django-import-export.

I couldn't reproduce this in the example app by declaring the following on the Book model:

    name = models.CharField(
        verbose_name=_("Name"),
        max_length=80,
        blank=True,  # <--- I think problem is here
    )

When we have seen this before it is because there is a custom field type (i.e. from a third party app) which is being identified as a CharField or subclass, but then is not being created with the correct Widget type.

If you could reproduce in the example app, or provide a failing test case, that would be ideal.

The other thing to check is that you are declaring resources correctly in the Admin file:

# this is correct
resource_classes = [YourResource]

# this is not correct
resource_class = YourResource

In the latter case, we have seen that this can cause issues.

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@matthewhegarty Sorry for late answer.

When we have seen this before it is because there is a custom field type (i.e. from a third party app) which is being identified as a CharField or subclass, but then is not being created with the correct Widget type.

You are right. Before v4 we added own CharWidget where replace None by empty strings.

Our solution:

class CharWidget(Widget):
    """Widget for converting text fields."""

    def clean(
        self,
        value: str | None,
        row: None = None,
        *args,
        **kwargs,
    ) -> str:
        """Return empty string for values which is None.

        Since CharField can only be blank, when importing, it needs to be
        convert none to an empty string.

        """
        value = super().clean(value, row, *args, **kwargs)

        return "" if value is None else value

But now as I can see it works out of the box: docstring and code

So I think we can just remove this part of code. Thank you for help!

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