wtforms 2.2 ignores default values

[siwesam]

After updating from v2.1 to v2.2 the default values disappeared from my form.
Is this a known issue?
The code is fairly simple:

class AForm(Form):
    AField = StringField('field', [validators.Length(min=4, max=500)], default='value')

form = AForm(request.form)

return render_template("/index.html", form=form)

In v2.2 the form is empty and I don't see the value 'value' in the field

[davidism]

Yes, something went wrong because of #280.

[davidism]

Actually, I think #280 just made it more obvious that #355 is needed.

[RemiZOffAlex]

Yes, default value not work.

    pagedata['form'] = forms.EditNoteForm(
        request.form,
        data={
            'title': pagedata['note'].title,
            'text': pagedata['note'].text
        }
    )

request.form is ImmutableMultiDict([]) and not is None if empty.

[davidism]

For what it's worth, Flask-WTF handles this correctly by not passing request.form unless the request method is POST. Although the underlying issue is the behavior of StringField.

[davidism]

Closed by #355

[davidism]

Released 2.2.1 which only sets the empty string if there's no initial value. In 3.0 the data will be None if there was no form data, consistent with the other fields.