How to override form field in CreateView

Question

In model form I can override form field like so

class waypointForm(forms.ModelForm):
    def __init__(self, user, *args, **kwargs):
        super(waypointForm, self).__init__(*args, **kwargs)
        self.fields['waypoints'] = forms.ModelChoiceField(queryset=Waypoint.objects.filter(user=user))

How can I use the same functionality in class based view CreateView, so that I can override form field?

I tried get_form_kwargs and get_form but all in vain. Do I need to create a model form?

Answer 1

You can override the get_form_kwargs and pass the user to kwargs dictionary. Then in your __init__() method, set your field on the form.

views.py

Pass the user in kwargs by overriding the get_form_kwargs().

class MyCreateView(CreateView):

    form_class = waypointForm

    def get_form_kwargs(self):
        kwargs = super(MyCreateView, self).get_form_kwargs()
        kwargs['user'] = self.request.user # pass the 'user' in kwargs
        return kwargs 

forms.py

Now, override the __init__() method. In that, pop the user key from kwargs and use that value to create your field.

class waypointForm(forms.ModelForm):

    def __init__(self, *args, **kwargs): 
        user = kwargs.pop('user', None) # pop the 'user' from kwargs dictionary      
        super(waypointForm, self).__init__(*args, **kwargs)
        self.fields['waypoints'] = forms.ModelChoiceField(queryset=Waypoint.objects.filter(user=user)) 

Answer 2

To use your model form in your view, set form_class. In your case, you need to override get_form_kwargs as well, so that you can pass user to the form.

def CreateWaypointView(CreateView):
    ...
    form_class = WaypointForm

    def get_form_kwargs(self):
        kwargs = super(CreateWaypointView, self).get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs