refactor(people): Move relationship answers to answer set

Answers to the relationship questions have been moved from the relationship
to another model RelationshipAnswerSet.  A new answer set is created each
time a user answers the relationship questions.

Resolves #16
Resolves #17
Resolves #18

people/views.py

@@ -3,7 +3,8 @@ Views for displaying or manipulating models in the 'people' app.
 """
 
 from django.http import HttpResponseRedirect
-from django.views.generic import CreateView, DetailView, ListView, UpdateView
+from django.urls import reverse
+from django.views.generic import CreateView, DetailView, FormView, ListView, UpdateView
 
 from . import forms, models, permissions
 
@@ -80,15 +81,18 @@ class RelationshipCreateView(permissions.UserIsLinkedPersonMixin, CreateView):
     """
     model = models.Relationship
     template_name = 'people/relationship/create.html'
-    form_class = forms.RelationshipForm
+    fields = [
+        'source',
+        'target',
+    ]
 
     def get_test_person(self) -> models.Person:
         """
-        
+        Get the person instance which should be used for access control checks.
         """
         if self.request.method == 'POST':
             return models.Person.objects.get(pk=self.request.POST.get('source'))
-        
+
         return models.Person.objects.get(pk=self.kwargs.get('person_pk'))
 
     def get(self, request, *args, **kwargs):
@@ -116,10 +120,59 @@ class RelationshipCreateView(permissions.UserIsLinkedPersonMixin, CreateView):
 
         return context
 
+    def get_success_url(self):
+        return reverse('people:relationship.update', kwargs={'pk': self.object.pk})
+
+
+class RelationshipUpdateView(permissions.UserIsLinkedPersonMixin, CreateView):
+    """
+    View for creating a :class:`Relationship`.
+
+    Displays / processes a form containing the :class:`RelationshipQuestion`s.
+    """
+    model = models.RelationshipAnswerSet
+    template_name = 'people/relationship/update.html'
+    form_class = forms.RelationshipAnswerSetForm
+
+    def get_test_person(self) -> models.Person:
+        """
+        Get the person instance which should be used for access control checks.
+        """
+        relationship = models.Relationship.objects.get(pk=self.kwargs.get('relationship_pk'))
+
+        return relationship.source
+
+    def get(self, request, *args, **kwargs):
+        self.relationship = models.Relationship.objects.get(pk=self.kwargs.get('relationship_pk'))
+        self.person = self.relationship.source
+
+        return super().get(request, *args, **kwargs)
+
+    def post(self, request, *args, **kwargs):
+        self.relationship = models.Relationship.objects.get(pk=self.kwargs.get('relationship_pk'))
+        self.person = self.relationship.source
+
+        return super().post(request, *args, **kwargs)
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        context['person'] = self.person
+        context['relationship'] = self.relationship
+
+        return context
+    
+    def get_initial(self):
+        initial = super().get_initial()
+        
+        initial['relationship'] = self.relationship
+        
+        return initial
+
     def form_valid(self, form):
         """
-        Form is valid - create :class:`Relationship` and save answers to questions.
+        Don't rebind self.object to be the result of the form - it is a :class:`RelationshipAnswerSet`.
         """
-        self.object = form.save()
-
-        return HttpResponseRedirect(self.object.get_absolute_url())
+        form.save()
+        
+        return HttpResponseRedirect(self.relationship.get_absolute_url())