Initial

app/base/views/toggle_checkin.py

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+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.shortcuts import redirect
+from django.utils import timezone
+from django.views import View
+
+from app.base.models import Person, Booking, BookingType
+
+
+class ToggleCheckinView(LoginRequiredMixin, View):
+    def get(self, *args, **kwargs):
+        user = Person.objects.get(id=kwargs['user_id'])
+        next = self.request.GET.get('next')
+        booking = user.current_checkin  # performs db query
+
+        if booking:
+            booking.end_time = timezone.now()
+            booking.save()
+        else:
+            plan = self.request.GET.get('plan')
+            # get() throws exception if not-exist. This is intended behavior!
+            # If you need `None` instead, use `filter().first()`
+            book_type = BookingType.objects.get(key=plan)
+            Booking.objects.create(
+                user=user, type=book_type, begin_time=timezone.now()
+            )
+
+        return redirect(next)