Introduce possibility to mark an AK Slot as fixed

This prevents it from being edited in scheduling view

AKModel/migrations/0042_akslot_fixed.py

+# Generated by Django 3.0.6 on 2020-11-04 23:31
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0041_constraint_violation'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='akslot',
+            name='fixed',
+            field=models.BooleanField(default=False, help_text='Length and time of this AK should not be changed', verbose_name='Scheduling Fixed'),
+        ),
+    ]

AKModel/models.py

@@ -316,6 +316,8 @@ class AKSlot(models.Model):
     duration = models.DecimalField(max_digits=4, decimal_places=2, default=2, verbose_name=_('Duration'),
                                    help_text=_('Length in hours'))
 
+    fixed = models.BooleanField(default=False, verbose_name=_('Scheduling Fixed'), help_text=_('Length and time of this AK should not be changed'))
+
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
 

AKScheduling/api.py

@@ -48,10 +48,10 @@ class EventsView(LoginRequiredMixin, EventSlugMixin, ListView):
                 "start": timezone.localtime(slot.start, self.event.timezone).strftime("%Y-%m-%d %H:%M:%S"),
                 "end": timezone.localtime(slot.end, self.event.timezone).strftime("%Y-%m-%d %H:%M:%S"),
                 "backgroundColor": slot.ak.category.color,
-                # TODO Mark conflicts here?
-                "borderColor": slot.ak.category.color,
+                "borderColor": "#ff291d" if slot.fixed else slot.ak.category.color,
                 "constraint": 'roomAvailable',
-                'url': str(reverse('submit:ak_detail', kwargs={"event_slug": self.event.slug, "pk": slot.ak.pk})),
+                "editable": not slot.fixed,
+                'url': str(reverse('admin:AKModel_akslot_change', args=[slot.pk])),
             } for slot in context["object_list"]],
             safe=False,
             **response_kwargs