How do I validate wtforms fields against one another?

Question

I have three identical SelectField inputs in a form, each with the same set of options. I can\'t use one multiple select.

I want to make sure that the u

Answer 1

Use FieldList like this:

def field_level(form, field):
    all_values = form.selects.data
    value = field.data

def list_level(form, field):
    all_values = field.data

class MyForm(Form):
    selects = FieldList(SelectField('label', validators=[field_level]), validators=[list_level])

form = MyForm()
form.append_entry()
form.append_entry()
form.append_entry()

You can have validators on Field level AND on FieldList level