Disabled field is considered for validation in WTForms and Flask

Question

I have some fields in page disabled as for example:(using jinja2 templating system)

    {{ form.na         


        

Answer 1

I defined my own validator for this problem:

from wtforms.validators import Optional

class OptionalIfDisabled(Optional):

    def __call__(self, form, field):
        if field.render_kw is not None and field.render_kw.get('disabled', False):
            field.flags.disabled = True
            super(OptionalIfDisabled, self).__call__(form, field)

And then I defined a new base for my forms:

from wtforms.form import Form

class BaseForm(Form):

    def populate_obj(self, obj):
        for name, field in self._fields.items():
            if not field.flags.disabled:
                field.populate_obj(obj, name)

Now every form can extend the BaseForm and disable fields like this:

from wtforms.fields import StringField, SubmitField

class TeamForm(BaseForm):
    team = StringField(label='Team Name', 
                       validators=[OptionalIfDisabled(), InputRequired()]
    submit = SubmitField(label='Submit')

    def __init__(self, *args, **kwargs):
        super(TeamForm, self).__init__(*args, **kwargs)
        # disable the fields if you want to
        if some_condition:
            self.team.render_kw = {'disabled': True}

After validation of the TeamForm, you can use populate_obj to copy the enabled form data in any object. It will ignore the disabled fields.