Automatically assign model instance to the user who created it. And only that user can edit/delete the instance.

[Jack Zhang]

Let's say I have a model called 'Dogs'.  Users can create instances of Dogs.  Let's say we have a user called User1.  I have 2 questions:

1. When User1 creates an instance of Dogs, how do I automatically assign that instance to User1?  I tried using a model field like this but it doesn't pick the user automatically:

user = models.ForeignKey(User, unique=False)

2. After the instance has been created, how do I make the instance only editable and removable by the user who made it?  Basically, if User1 creates an instance of Dogs, only User1 can edit and delete that instance. 

Thanks.

[mohammad k]

try that in your views

form = Dog_Form(request.POST)
if form.is_valid():
    form_save = form.save(commit=False)
    form_save.user = request.user # user is logged in
    form.save()

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[mohammad k]

for question 2 :

    def get_queryset(self):  # the user want to edit this post must be owner this post

        post_qs = super(UpdatePost, self).get_queryset()

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

[Jack Zhang]

Thanks for your response.  This is an off-topic question but I can't figure out how to get 'request' working.  I'm using the CreateView generic class, so there's no space to insert 'request'.  This is what my code looks like.  When I try to run it, it tells me that request is not found.  

class ListingCreateView(LoginRequiredMixin, CreateView):

    model = BuyerListing

    

    form_class = PostListing(self.request.POST)

    if form.is_valid():

        form_save = form.save(commit=False)

        form_save.user = request.user # user is logged in

        form.save()

        

    def get_queryset(self):  # the user want to edit this post must be owner this post

        post_qs = super(PostListing, self).get_queryset()

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

On Tuesday, October 24, 2017 at 12:35:15 PM UTC-4, k2527806 wrote:

try that in your views

form = Dog_Form(request.POST)
if form.is_valid():
    form_save = form.save(commit=False)
    form_save.user = request.user # user is logged in
    form.save()

On Tue, Oct 24, 2017 at 7:37 PM, Jack Zhang <valac...@gmail.com> wrote:

Let's say I have a model called 'Dogs'.  Users can create instances of Dogs.  Let's say we have a user called User1.  I have 2 questions:

1. When User1 creates an instance of Dogs, how do I automatically assign that instance to User1?  I tried using a model field like this but it doesn't pick the user automatically:

user = models.ForeignKey(User, unique=False)

2. After the instance has been created, how do I make the instance only editable and removable by the user who made it?  Basically, if User1 creates an instance of Dogs, only User1 can edit and delete that instance. 

Thanks.

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[mohammad k]

class Upload(FormView):

    http_method_names = ['get', 'post']

    template_name = 'public/upload.html'

    success_url = reverse_lazy('upload')

    form_class = UploadForms

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

        form = self.form_class(user=request.user)

        return render(request, self.template_name, {'form': form})

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

        form = self.form_class(request.POST, request.FILES, user=request.user)

        if form.is_valid():

            data = form.save(commit=False)

            data.user = request.user

            data.save()

            messages.add_message(request, messages.SUCCESS, self.success_message)

            return redirect(self.success_url)

        return render(request, self.template_name, {'form': form})

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[mohammad k]

use FormView

https://docs.djangoproject.com/en/1.11/ref/class-based-views/generic-editing/#formview

[mohammad k]

that your code : 

class CreatePost(CreateView):

    model = Post

    def form_valid(self, form):

        form.instance.user = self.request.user

        return super(CreatePost, self).form_valid(form)

[Jack]

I tried using FormView but kept running into errors.  I used your second response and it worked!  I don't fully understand the code, but it seems to work flawlessly.

Thank you so much! I own you a big one.

use FormView

https://docs.djangoproject.com/en/1.11/ref/class-based-views/generic-editing/#formview

[mohammad k]

when you submited form, form_valid will called in CreateView and give you a instance of user form submited (form parameter in form_valid function) and you set user to logged user (self.request.user)

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