Django Inline-Formularsatz, das kein Zwischenmodell ohne pk löscht?

Question

Ich habe ein Inline-formset von diesem accepted answer

implementiert ich ein Problem habe, wenn nämlich die formset Speichern es keine Datensätze löschen nicht

Wir haben es in den formsets save method verfolgen können:

def form_valid(self, form): 
      '''Handle saving of the project membership formset 
      ''' 
      context = self.get_context_data() 
      project_memberships = context['projectmembership_formset'] 
      if project_memberships.is_valid(): 
       self.object = form.save() 
       project_memberships.instance = self.object 
       project_memberships.save() 

Und wenn wir tiefer in die save Methode gehen, erhalten wir:

def save_existing_objects(self, commit=True): 
     self.changed_objects = [] 
     self.deleted_objects = [] 
     if not self.initial_forms: 
      return [] 

     saved_instances = [] 
     forms_to_delete = self.deleted_forms 
     for form in self.initial_forms: 
      obj = form.instance 
      # If the pk is None, it means either: 
      # 1. The object is an unexpected empty model, created by invalid 
      # POST data such as an object outside the formset's queryset. 
      # 2. The object was already deleted from the database. 
      if obj.pk is None: 
       continue 
      if form in forms_to_delete: 
       self.deleted_objects.append(obj) 
       self.delete_existing(obj, commit=commit) 
      elif form.has_changed(): 
       self.changed_objects.append((obj, form.changed_data)) 
       saved_instances.append(self.save_existing(form, obj, commit=commit)) 
       if not commit: 
        self.saved_forms.append(form) 
     return saved_instances 

Was ich finde ist, dass die pk der obj leer ist und daher keine Löschung jemals passiert.

POST Daten:

'projectmembership_set-0-id': [ 
    '8' 
    ], 
    'projectmembership_set-0-user': [ 
    '1' 
    ], 
    'projectmembership_set-0-is_project_manager': [ 
    'on' 
    ], 
    'projectmembership_set-0-full_time_equivalent': [ 
    '100.00' 
    ], 
    'projectmembership_set-0-DELETE': [ 
    'on' 
    ], 
    'projectmembership_set-1-id': [ 
    '9' 
    ], 
    'projectmembership_set-1-user': [ 
    '3' 
    ], 
    'projectmembership_set-1-is_project_manager': [ 
    'on' 
    ], 
    'projectmembership_set-1-full_time_equivalent': [ 
    '100.00' 
    ], 
    'projectmembership_set-1-DELETE': [ 
    'on' 
    ], 
    'projectmembership_set-2-id': [ 
    '10' 
    ], 
    'projectmembership_set-2-user': [ 
    '7' 
    ], 
    'projectmembership_set-2-full_time_equivalent': [ 
    '50.00' 
    ], 
    'projectmembership_set-2-DELETE': [ 
    'on' 
    ], 

Warum die Objekte nicht pk haben und gelöscht werden, nicht wahr?

Answer 1

Basierend auf den Antworten auf Class based viewINline formset

Die get_context_data mit den POST Daten in dem UpdateView Bedarf eine Instanz wird ebenfalls gegeben.

if self.request.POST: 
      context['projectmembership_formset'] = ProjectMembershipFormSet(
       self.request.POST, 
       instance=self.object 
      )