Accessing request.user in class based generic view CreateView in order to set FK field in Django

问题

So I have a model that includes:

class Place(models.Model):
    ....
    created_by = models.ForeignKey(User)

My view is like so:

class PlaceFormView(CreateView):
    form_class = PlaceForm

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(PlaceFormView, self).dispatch(*args, **kwargs)

Is there a way for me to access request.user and set created_by to that user? I've looked through the docs, but can't seem to find any hints toward this.

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回答1:

How about overriding form_valid which does the form saving? Save it yourself, do whatever you want to it, then do the redirect.

class PlaceFormView(CreateView):
    form_class = PlaceForm

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(PlaceFormView, self).dispatch(*args, **kwargs)

    def form_valid(self, form):
        obj = form.save(commit=False)
        obj.created_by = self.request.user
        obj.save()        
        return http.HttpResponseRedirect(self.get_success_url())

回答2:

I know that this is old, but for other people with this problem:

There is an even simpler way - since saving a form multiple times will always use the same model instance, you can also do:

def form_valid(self, form):
    obj = form.save(commit=False)
    obj.created_by = self.request.user
    return super(PlaceFormView, self).form_valid(form)

That way, you get all the benefits of the super call - it's trivial to see that you're really only adding those two lines of code, and you don't have to repeat yourself by replicating the redirect logic.

回答3:

An alternate way to do this is to pass the user through overwriting the get_initial() method in the CreateView, and modify save method in the PlaceForm class to save the user:

class PlaceForm(forms.ModelForm):
    ...
    ...
    ...

    def __init__(self, *args, **kwargs):
        self.created_by = kwargs['initial']['created_by']
        super(PlaceForm, self).__init__(*args, **kwargs)

    def save(self, commit=True):
        obj = super(PlaceForm, self).save(False)
        obj.created_by = self.created_by
        commit and obj.save()
        return obj

class PlaceFormView(CreateView):
    ...
    ...
    form_class = PlaceForm

    def get_initial(self):
        self.initial.update({ 'created_by': self.request.user })
        return self.initial

This way the saving logic is still encapsulated within the form class.

来源：https://stackoverflow.com/questions/5785727/accessing-request-user-in-class-based-generic-view-createview-in-order-to-set-fk