Collection membership: implement leaving/revoking access.

django_etesync/migrations/0013_collectionmemberremoved.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.0.3 on 2020-05-27 11:29
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('django_etesync', '0012_auto_20200527_0743'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CollectionMemberRemoved',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('collection', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='removed_members', to='django_etesync.Collection')),
+                ('stoken', models.OneToOneField(null=True, on_delete=django.db.models.deletion.PROTECT, to='django_etesync.Stoken')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'unique_together': {('user', 'collection')},
+            },
+        ),
+    ]