Add a viewset to control collection membership.

django_etesync/models.py

@@ -121,12 +121,13 @@ class RevisionChunkRelation(models.Model):
         ordering = ('id', )
 
 
-class CollectionMember(models.Model):
-    class AccessLevels(models.TextChoices):
-        ADMIN = 'adm'
-        READ_WRITE = 'rw'
-        READ_ONLY = 'ro'
+class AccessLevels(models.TextChoices):
+    ADMIN = 'adm'
+    READ_WRITE = 'rw'
+    READ_ONLY = 'ro'
 
+
+class CollectionMember(models.Model):
     collection = models.ForeignKey(Collection, related_name='members', on_delete=models.CASCADE)
     user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
     encryptionKey = models.BinaryField(editable=True, blank=False, null=False)