Use of django-friendly-captcha in a contact form

forms.py

# -*- coding: utf-8 -*-
import re

from django import forms
from django.conf import settings
from django.utils.translation import gettext_lazy as _
from friendly_captcha.fields import FrcCaptchaField

from contact.models import Filter, ContactMessage


class ContactForm(forms.ModelForm):

    class Meta:
        model = ContactMessage
        fields = (
            'name', 'email', 'subject', 'text'
        )

    def __init__(self, *args, **kwargs):
        super(ContactForm, self).__init__(*args, **kwargs)
        if getattr(settings, 'CONTACT_USE_HONEYPOT', False):
            self.fields['comment'] = forms.CharField(
                label=_('comment'),
                max_length=100,
                required=False
            )
            self.Meta.fields += ('comment',)

    if getattr(settings, 'CONTACT_USE_CAPTCHA', False):
        captcha = FrcCaptchaField()

    def clean_subject(self):
        """ Check subject for unwanted content to avoid spam """
        subject = self.cleaned_data['subject']
        for filter in Filter.objects.all():
            if re.search(filter.regex, subject, re.IGNORECASE) is not None:
                raise forms.ValidationError(filter.errormsg, code='invalid_content')
        return subject

    def clean_text(self):
        """ Check message for unwanted content to avoid spam """
        text = self.cleaned_data['text']
        for filter in Filter.objects.all():
            if re.search(filter.regex, text, re.IGNORECASE) is not None:
                raise forms.ValidationError(filter.errormsg, code='invalid_content')
        return text