add a related_name for the camp relation for TeamArea, and a teams property to Camp model to make it easier to get all teams under all teamareas, also add exclude=None to the validate_unique call in our CleanedModel class

src/camps/models.py

@@ -188,3 +188,10 @@ class Camp(CreatedUpdatedModel, UUIDModel):
             return False
         else:
             return True
+
+    @property
+    def teams(self):
+        """ Return a queryset with all teams under all TeamAreas under this Camp """
+        from teams.models import Team
+        return Team.objects.filter(area__in=self.teamareas.all())
+

src/teams/migrations/0020_auto_20180304_1233.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2018-03-04 11:33
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('teams', '0019_auto_20180304_1019'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='teamarea',
+            name='camp',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='teamareas', to='camps.Camp'),
+        ),
+    ]

src/teams/models.py

@@ -18,7 +18,7 @@ class TeamArea(CampRelatedModel):
 
     name = models.CharField(max_length=255)
     description = models.TextField(default='')
-    camp = models.ForeignKey('camps.Camp')
+    camp = models.ForeignKey('camps.Camp', related_name="teamareas", on_delete=models.PROTECT)
     responsible = models.ManyToManyField(
         'auth.User',
         related_name='responsible_team_areas'

src/utils/models.py

@@ -20,7 +20,7 @@ class CleanedModel(models.Model):
             # which is not supposed to happen. Call them manually one by one instead.
             self.clean_fields()
             self.clean()
-            self.validate_unique()
+            self.validate_unique(exclude=None)
         except ValidationError as e:
             message = "Got ValidationError while saving: %s" % e
             if hasattr(self, 'request'):