Django filter the queryset of ModelChoiceField

Question

I'm been using a form field called ModelChoiceField and querying by all the objects but it's not extactly what I intended to use it for.

 class PictureForm(forms.ModelForm):
    Whiteboard = forms.ModelChoiceField(queryset=Whiteboard.objects.all())

I'm been trying to use the ModelChoiceField to query for all the WhiteBoard objects that belong to a particular user

Whiteboard = forms.ModelChoiceField(queryset=Whiteboard.objects.filter(user=request.user))

but I discovered that the request does not pass to the ModelForm .I'm been searching through SO for various solution and one solution was to override the forms's init()

This is probably the closest question that relate to my problem How to use the request in a ModelForm in Django

This was his solution .If his solution was to override the queryset at the views . How Does he create the ModelChoiceField without a queryset at the forms.py

In my case , I want filter all the whiteboards by users. How could I do it?

Parts of my module

class Whiteboard(models.Model):

    Category =models.CharField(max_length=30,choices=CATEGORY)
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100)
    picture = models.OneToOneField('Picture',related_name='picture',blank=True,null=True)
    def __unicode__(self):
        return self.name

class Picture(models.Model):
    user = models.ForeignKey(User)
    Whiteboard = models.ForeignKey(Whiteboard,blank=False,null=False,related_name='board')
    image = models.FileField(upload_to="images/",blank=True)
    description = models.TextField()
    is_primary = models.BooleanField(default=False)

    def __unicode__(self):
        return self.description

My views.py

def PictureCreator(request):
if not request.user.is_authenticated():
    return HttpResponseRedirect(reverse('world:LoginRequest'))

if request.method == "POST":
    form = PictureForm(request.POST , request.FILES)
    if form.is_valid():
        picture = Picture(user=request.user)
        image = request.FILES.get('image')
        if image:
                            picture.image = form.cleaned_data['image']
                    description = form.cleaned_data['description']
        if description:
                            picture.description = form.cleaned_data['description']

        if board:
                            picture.board = form.cleaned_data['board']
        picture.save()
        board = Whiteboard.objects.get(Whiteboard=picture.board)
        the_id = board.id
    return HttpResponseRedirect(reverse('world:Boat', kwargs={'animal_id': the_id }))   

return render(request,'picture.html',{'form':PictureForm()})

picture.html

<form method="POST" enctype="multipart/form-data">
    {% csrf_token %}
{{ form.as_p }}
<input type = "submit" value= "Add Picture" />
 </form>

Answer 1

Pass user in init then in your form in the view you must pass the user value PictureForm(request.user)

class PictureForm(forms.ModelForm):
    class Meta:
        model = Picture

    def __init__(self, user, *args, **kwargs):
        super(PictureForm, self).__init__(*args, **kwargs)
        self.fields['Whiteboard'].queryset = Whiteboard.objects.filter(user=user)


def PictureCreator(request):
    if not request.user.is_authenticated():
        return HttpResponseRedirect(reverse('world:LoginRequest'))

    if request.method == "POST":
        form = PictureForm(request.user, request.POST, request.FILES)
        if form.is_valid():
            picture = Picture(user=request.user)

            image = request.FILES.get('image')
            if image:
                picture.image = form.cleaned_data['image']

            description = form.cleaned_data['description']
            if description:
                picture.description = form.cleaned_data['description']

            if board:
                picture.board = form.cleaned_data['board']
            picture.save()

            board = Whiteboard.objects.get(Whiteboard=picture.board)
            the_id = board.id
        return HttpResponseRedirect(reverse('world:Boat', kwargs={'animal_id': the_id }))   
    return render(request,'picture.html',{'form':PictureForm(request.user)})

Answer 2

Do not set a filter at all during class definition. You'll override it in your view.

form = PictureForm()
form.fields['whiteboard'].queryset = Whiteboard.objects.filter(user=request.user)

class PictureForm(ModelForm):
   whiteboard = forms.ModelChoiceField(queryset=Whiteboard.objects.none(),)