Creating and updating Model object using form

Question

models.py

class PostModel(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    date_time = models.DateTimeField(auto_now_add=True)
    title = models.TextField(null=True)
    body = models.TextField(null=True)
    def __str__(self):
        return str(self.user)

class ImagesPostModel(models.Model):
    post = models.ForeignKey(PostModel, on_delete=models.CASCADE)
    images = models.ImageField(null=True, blank=True)

views.py

def post(request):
    post = PostModel(user=request.user)
    post.save()
    if request.method == 'POST':
        form = PostModelForm(request.POST, instance=post)
        images = request.FILES.getlist('images')
        for image in images:
            ImagesPostModel.objects.create(post=post, images=image)
        if form.is_valid():
            form.save()
        return redirect('/Blog/home/')
    else:
        form = PostModelForm(request.POST)
        return render(request, 'post.html', {'form': form})

I created a PostModel object post and save it in the database using save() method. I have provided the instance parameter as post object in the form, so the form should be updating the above created post but it is creating another PostModel object and inserting into the database by itself. So there are two post begin created and being inserted into the database, first one is because of post = PostModel(user=request.user) and I dont know why the second one is being created. why is this happening?

Mohamed ElKalioby · Accepted Answer · 2022-02-14 09:31:16Z

1

The problem is the first 2 lines in the view

post = PostModel(user=request.user)
post.save()

As they create a PostModel obj with user=currentuser

To add the post to the user do the following rather than form.save()

post = form.save(commit=False)
post.user = request.user
post.save()

edited Feb 14, 2022 at 9:31

answered Feb 14, 2022 at 9:19

Mohamed ElKalioby

2,3541 gold badge14 silver badges14 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Vansh_Chaudhary Over a year ago

A user can have any number of posts. What should I do then?

Mohamed ElKalioby Over a year ago

Check Updated answer

Mohamed ElKalioby Over a year ago

Please accept the answer to close the question.

Collectives™ on Stack Overflow

Creating and updating Model object using form

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related