Filter queryset inside a form

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I have one app that holds a list of work orders, and another app that holds list of parts.

class Order(models.Model):
  parts = models.ManyToManyField(Part, blank=True) # Assosiated parts

class Part(models.Model):
  partnum = models.CharField(max_length=20) # Part number
  mwos = models.ManyToManyField('mtn.Order', blank=True) # Assosiated work orders

Now i want to add a button to my DetailView for order which will open a list of parts, which i will be able to add to my order. At the moment i have a created an UpdateView for my order

class AddPartView(LoginRequiredMixin, UserPassesTestMixin, UpdateView):   
    model = Order
    form_class = AddPartForm
    ...

and a form

class AddPartForm(forms.ModelForm):
    class Meta:
        model = Order
        fields = ['parts', ]
        labels = {'parts': "Parts", }

    def FilterList(request):
        qs = Part.objects.all()
        search_part_query = request.GET.get('search_part')

        if is_valid_queryparam(search_part_query):
            qs = qs.filter(Q(partnum__icontains=search_part_query) 
                | Q(descr__icontains=search_part_query)
                ).distinct()

        return qs         

    def __init__(self, *args, **kwargs):

        super(AddPartForm, self).__init__(*args, **kwargs)

        self.fields["parts"].widget = CheckboxSelectMultiple()
        self.fields["parts"].queryset = self.FilterList()

for this template

{% block content %}

  <form method="GET" action=".">
    <div class="form-row justify-content-start">
      <div class="form-group col-md align-self-center">
        <div class="input-group">
          <input class="form-conrol py-2 border-right-0 border" type="search" placeholder="Find part" name="search_part">
            <span class="input-group-append">
              <div class="input-group-text bg-transparent">
                <i class="fa fa-search"></i>
              </div>
            </span>                      
        </div>
      </div>            
    </div>
    <button type="submit" class="btn btn-primary btn-sm btn-block">Search</button>    
  </form>

  <form action="{% url 'mtn:add_part' order.id %}" method='post'>
    {% csrf_token %}
    {{ form.as_p }}  
    <button type="submit">Save</button>
  </form>

{% endblock content %}

But when i'm executing it i get 'AddPartForm' object has no attribute 'GET' error.

I am new to programming, so maybe i am approaching this the wrong way.

python-3.x django python
1 Answers

A form is normally not aware of the request object. You can make such a form, for example with:

class AddPartForm(forms.ModelForm):
    class Meta:
        model = Order
        fields = ['parts', ]
        labels = {'parts': "Parts", }
        widgets = {
            'parts': CheckboxSelectMultiple
        }

    def filter_list(self, request):
        qs = Part.objects.all()
        search_part_query = request.GET.get('search_part')

        if is_valid_queryparam(search_part_query):
            qs = qs.filter(Q(partnum__icontains=search_part_query) 
                | Q(descr__icontains=search_part_query)
                ).distinct()

        return qs         

    def __init__(self, *args, request=None, **kwargs):
        super(AddPartForm, self).__init__(*args, **kwargs)
        self.fields["parts"].queryset = self.filter_list(request)

In the AddPartView, you can the pass the request as parameter to the form by overriding the .get_form_kwargs(..) method [Django-doc]

class AddPartView(LoginRequiredMixin, UserPassesTestMixin, UpdateView):   
    model = Order
    form_class = AddPartForm

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs.update(request=self.request)
        return kwargs
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