WTForms FieldList required Optional validation

Question

Currently I'm using Flask with WTForms via Flask-WTForms but being stuck with FieldList. I use FieldList for a list of email address like this:

class MailToForm(Form):
    emailAddress = StringField(
        'Email',
        validators=[
            validators.DataRequired(),
            validators.Email()
        ]
    )

Then I have another form to use it above form:

class JobForm(Form):
    name = StringField('Name',
                       validators=[
                           validators.DataRequired()
                       ])
    annotation = TextAreaField('Annotation')
    emails = FieldList(FormField(MailToForm),
                       'Send Result To',
                       min_entries=1)

The problem here is that when I submit the form with all valid data the validate_on_submit function won't return True if I not pass a new Optionals validation for emails field in JobForm . But then the form will valid event if I pass invalid data to emailAddress .

Please help me on this!

Answer 1

I got how to get away with this. I have to add the WTF's hidden fields of subforms so it can be validated.