I'm Having Problems With Wtforms Selectfields When I Use A Post With Flask

I'm pretty new to wtforms and flask and was messing around with selectfields and got an error. The form itself works just fine without the selectfield but with it I get the followi

Solution 1:

You need to set your choices before you call validate_on_submit as form.validate will attempt to validate the provided value (if any) against the list of choices (which is None before you set choices):

form = PostForm()
form.hometest.choices = [(h.key.id(), h.homename) for h in Home.query()]

if form.validate_on_submit():
    # form is valid, continue

Solution 2:

You should provide choices=[...] argument, like

wtf.SelectField(u'Home Name List',
                choices=[(1, 'Label 1'),
                         (2, 'Label 2')],
                coerce=int,
                validators=[validators.optional()])