Django 4 Error 'Form' object has no attribute 'instance' - AttributeError

If your are using Django 4 and making project crud operation with the help if Mixins and Generic View

 like list View , Create View, Update View etc,

And Your are phasing Attribute error on form_valid () function with current user instance so I also got this error in my project i have researched and find one solution hope its work for your problem too its works with me 

You can use this

You can use try and except of python with this form_valid () function of CBV or mixin view with object

Solution:

                    try:

           

form.instance.owner = self.request.user

        except:

            form.owner = self.request.user

 

   

Here is Full Function With My Solution

    def form_valid(self,form):

        try:

            form.instance.owner = self.request.user

        except:

            form.owner = self.request.user

        return super().form_valid(form)

        #form.instance.owner = self.request.user

        return super().form_valid(form)

 

Here is Full Code of my project may be it can help you more

from django.shortcuts import render

# Create your views here.

from django.urls import reverse_lazy

from django.views.generic.list import ListView

from django.views.generic.edit import CreateView, UpdateView, \

 DeleteView

from django.contrib.auth.mixins import LoginRequiredMixin, \

 PermissionRequiredMixin

from .models import ModelName

class UserMixin(object):

    def get_queryset(self):

        qs = super().get_queryset()

        return qs.filter(user=self.request.user)

class UserEditMixin(object):

    def form_valid(self,form):

        try:

            form.instance.user = self.request.user

        except:

            form.user = self.request.user

        return super().form_valid(form)

        #form.instance.User = self.request.user

   

class UserModelNameMixin(UserMixin, LoginRequiredMixin,PermissionRequiredMixin):

    model = ModelName

    fields = ['subject', 'title', 'slug', 'overview']

    success_url = reverse_lazy('manage_ModelName_list')

class UserModelNameEditMixin(UserModelNameMixin, UserEditMixin):

    template_name = 'ModelNames/manage/ModelName/form.html'

class ManageModelNameListView(UserModelNameMixin, ListView):

    template_name =  'ModelNames/manage/ModelName/list.html'

    permission_required = 'ModelNames.view_ModelName'

class ModelNameCreateView(UserModelNameEditMixin, CreateView):

    permission_required = 'ModelNames.add_ModelName'

class ModelNameUpdateView(UserModelNameEditMixin, UpdateView):

    permission_required = 'ModelNames.change_ModelName'

class ModelNameDeleteView(UserModelNameEditMixin, DeleteView):

    template_name = 'ModelNames/manage/ModelName/delete.html'

    permission_required = 'ModelNames.delete_ModelName'

   

#Finally, you create the following views that subclass

         

This Error Specific for latest Django version 4 because this code are using in Django 3 by Example by Antinio Mele  Books  I am learning from that books but i have stuck in this so i have to find solution So, I got this Hope It will also Help in Your Problem

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