How do I generate dynamic fields in WTForms

Question

I am trying to generate a form in WTForms that has dynamic fields according to this documentation http://wtforms.simplecodes.com/docs/1.0.2/specific_problems.html#dynamic-fo

Answer 1

class BaseForm(Form):
    @classmethod
    def append_field(cls, name, field):
        setattr(cls, name, field)
        return cls

from forms import TestForm
form = TestForm.append_field("do_you_want_fries_with_that",BooleanField('fries'))(obj=db_populate_object)

I use the extended class BaseForm for all my forms and have a convenient append_field function on class.

Returns the class with the field appended, since instances (of Form fields) can't append fields.