Class Base View Foreign key

[sebasti...@gmail.com]

Hello,

I have a CBV with Createview. Now i have a Foreign Key from Box to Tabs model. When i submit request then i get error: Cannot assign "1": "Box.tabs_link" must be a "Tabs" instance. This happens on form.is_valid

I understand this error but i don't know how can i fix this. 

Models.py:

class Box(models.Model):

    id = models.AutoField(primary_key=True)

    name = models.CharField(max_length=200, default="", blank=False, null=False) #Überschrift der Box

    tabs_link = models.ForeignKey(Tabs, on_delete=models.CASCADE, null=False,blank=False,choices=[

                                (c.id, c.name) for c in Tabs.objects.all()]

                                   )

    column = models.PositiveIntegerField(choices=column_choices,blank=False, null=False,default=0) #linke oder rechte Seite

    position = models.PositiveIntegerField(default=1,blank=False, null=False) #position auf der linken/rechten Seite

    modul = models.PositiveIntegerField(choices=Modul_Auswahl,

                                        default=0)  

    class Meta:

        ordering = ["position","column"]

    def __str__(self):

        return self.name

Views.py:

class BoxCreateView(CreateView):

    model = Box

    template_name = 'marketing/boxcreate.html'

    form_class = Boxform

    success_url = reverse_lazy('boxlist')

    def post(self, request, *args, **kwargs):

        formbox = Boxform(self.request.POST)

        if (formbox.is_valid()):

           pass

Forms.py

class Boxform(forms.ModelForm):

    class Meta:

        model = Box

        exclude = ('',)

        labels = {

            'tabs_link': 'Tabulator',

            'column': 'Spalte',

        }

        widgets = {

            'name': textinputfeld,

            'position': integerfeld,

            'column': integerfeld,

            'modul': selectfield,

            'tabs_link': selectfield,

        }

Regards

[Ryan Nowakowski]

I think choices is causing the problem. Try limit_choices_to instead:

https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.ForeignKey.limit_choices_to

[Rob Wilkinson]

I had similar issues, I found this helpful:

https://groups.google.com/g/django-users/c/PcSDKZhPVmc

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[sebasti...@gmail.com]

Hey,

thanks for you response. Before i save i want to make is_valid() and there came this exception.

Regards

[Rob Wilkinson]

This is what my code looks like and it now works :

see where it says "example of setting pk..." below:

def dyn_menu_new(request):

    from .models import menu as menuX

    from .models import buttons

    if request.method == 'POST':

        if request.user.is_superuser:

           super_user = "superuser"

        else:

           super_user = ""

        form = dyn_menuForm(request.POST,name=request.user.username,super_user=super_user)

        if form.is_valid():

            menu_id          = request.POST.get('menu_id', '')

            menu_id          = menu_id.replace(" ", "")

            menu_title       = request.POST.get('menu_title', '')

            menu_notes       = request.POST.get('menu_notes', '')

            menu_fb          = request.POST.get('menu_fb', '')

            menu_link        = request.POST.get('menu_link', '')

            menu_align       = request.POST.get('menu_align', '')

            menu_order       = request.POST.get('menu_order', '')

            menu_status      = request.POST.get('menu_status', '')

            menu_admin       = request.POST.get('menu_admin', '')

            menu_image       = request.POST.get('menu_image', '')

            #

            # example of setting pk : https://groups.google.com/g/django-users/c/PcSDKZhPVmc

            #

            buttons_pk = request.POST.get('menu_dropdown')

            menu_dropdown = buttons.objects.get(pk=buttons_pk)

            #

            menu_new_window  = request.POST.get('menu_new_window', '')

            menu_scope  = request.POST.get('menu_scope', '')

            current_user = request.user

            menu_user  = current_user

            p = menuX(menu_id=menu_id, menu_title=menu_title, menu_notes=menu_notes, menu_fb=menu_fb, menu_link=menu_link, menu_align=menu_align, menu_order=menu_order, menu_status=menu_status, menu_admin=menu_admin, menu_image=menu_image, menu_dropdown=menu_dropdown, menu_new_window=menu_new_window,menu_scope=menu_scope,menu_user=menu_user)

            try:

               p.save()

            except:

               messages.error(request, "Menu ID is not unique. Please specify a different Menu ID.")

               return render(request, 'dyn_menu.html', {'form': form})

            return redirect("/theme/dyn_menu_list")

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/3a53be95-069b-434c-bdfa-b71c0d5fd9c5n%40googlegroups.com.

[Sky Lord]

What's that, am new please

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAAdSEeamDUxsGD3qmpBYq-kB34%3DaMTDUApe0WC3NM25Osoy4wQ%40mail.gmail.com.