The form_valid() method does not work, although it is valid

Using Django Forms & APIs
1

I have a Business Type Model that stores business areas, and I also have a BusinessСategory Model that stores business categories based on the general area

Example: Catering - Bar, restaurant, Retail - store, car showroom, etc.

I want to display a form that, using a queryset, will substitute the necessary categories
Дальше планирую сохранять эту информацию, но функция form_falid не работает, хотя в request.POST - есть эта информация

model.py

class BusinessCategory(models.Model):
    title = models.CharField(max_length=50, null=True, blank=True)
    type_id = models.ForeignKey('BusinessType', on_delete=models.PROTECT, verbose_name='Тип бизнеса')

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "Категория бизнеса"
        verbose_name_plural = "Категории бизнеса"

code forms.py

class BusinessCategoryForm(forms.ModelForm):
    title = forms.ModelChoiceField(
        widget=forms.RadioSelect(),
        queryset=BusinessCategory.objects.none(),
        to_field_name='title',
    )

    class Meta:
        model = BusinessCategory
        fields = ('title', )

    def __init__(self, *args, type_id=None, **kwargs):
        super(BusinessCategoryForm, self).__init__(*args, **kwargs)
        if type_id is not None:
            queryset = BusinessCategory.objects.filter(type_id=type_id)
            self.fields['title'].queryset = queryset

code views.py

class BusinessCategoryView(FormView):
    template_name = 'quiz/category.html'
    success_url = '/'
    form_class = BusinessCategoryForm  # Здесь должно быть определение вашего класса формы


    def get_form(self, form_class=None):
        type_id = self.request.session.get("type")
        return self.form_class(type_id=type_id)

    def form_valid(self, form):
        print("OK")
        category = form.cleaned_data["title"]
        print(category)
        self.request.session["category"] = category.pk
        user = User.objects.get(email=self.request.session["user_email"])
        user.cat = category
        user.save()
        return super().form_valid(form)

    def form_invalid(self, form):
        print("Form is invalid")
        print(self.request.POST)
        return super().form_invalid(form)

print(“OK”) don’t work

{% block content %}
<h2>Choose Business Categories</h2>
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
{{form.errors }}

        <button type="submit">Submit</button>
    </form>

{% endblock %}

Help me, pls

2

Trying to resolve this is going to require some more investigation on your part.

Either using a debugger or adding some print statements, you’re going to want to confirm that the session contains the value you’re expecting it to have, and that the queryset in your form’s __init__ function is getting the right results and that the form being returned by get_form is correct.

3

What methods should I try?
I tried to override the post method in BusinessCategoryView, but it didn’t work. the self.is_valid() method returns False, but there are no errors inside

4

Am I getting the queryset correctly? There may be an error in the form…

5

We can’t determine that from what you have here. That’s why you need to do the debugging. You’ll need to verify data at every key location where it’s being used.