class F(Form): empty = KeyPropertyField(reference_class=AncestorModel)
class F(Form): author = KeyPropertyField(reference_class=Author)
class RastileimauksetForm(RastileimauksetBaseForm): aika = StringField('aika', validators=[InputRequired(), validateAika]) rasti = KeyPropertyField(reference_class=Rasti, get_label=rasti_label) #, validate_koodi)