feat(activities,people): Allow people to attend activities

resolve #13

activities/views.py

@@ -1,9 +1,14 @@
 """
 Views for displaying / manipulating models within the Activities app.
 """
-from django.views.generic import DetailView, ListView
+import json
+
+from django.http import HttpResponse
+from django.views.generic import DetailView, ListView, View
+from django.views.generic.detail import SingleObjectMixin
 
 from . import models
+from people import models as people_models
 
 
 class ActivitySeriesListView(ListView):
@@ -38,3 +43,44 @@ class ActivityDetailView(DetailView):
     """
     model = models.Activity
     template_name = 'activities/activity/detail.html'
+    
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        
+        context['user_is_attending'] = self.object.attendance_list.filter(pk=self.request.user.person.pk).exists()
+        
+        return context
+    
+
+class ActivityAttendanceView(SingleObjectMixin, View):
+    """
+    View to add or delete attendance of an activity.
+    """
+    model = models.Activity
+    
+    def post(self, request, *args, **kwargs):
+        self.object = self.get_object()
+
+        if request.is_ajax():
+            data = json.loads(request.body)
+            
+            person = people_models.Person.objects.get(pk=data['pk'])
+            self.object.attendance_list.add(person)
+
+            return HttpResponse(status=204)
+
+        pass
+
+    def delete(self, request, *args, **kwargs):
+        self.object = self.get_object()
+
+        if request.is_ajax():
+            data = json.loads(request.body)
+
+            person = people_models.Person.objects.get(pk=data['pk'])
+            self.object.attendance_list.remove(person)
+
+            return HttpResponse(status=204)
+
+        pass
+