Merge pull request #111 from dannybrowne86/master

added database-level enforcement of unique user+primary pair in Avatar model

avatar/migrations/0002_add_user_primary_unique_together.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('avatar', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='avatar',
+            unique_together=set([('user', 'primary')]),
+        ),
+    ]

avatar/models.py

@@ -72,6 +72,7 @@ class Avatar(models.Model):
 
     class Meta:
         app_label = 'avatar'
+        unique_together = ('user', 'primary')
 
     def __unicode__(self):
         return _(six.u('Avatar for %s')) % self.user