fix sites migrations

{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/config/common.py

@@ -65,6 +65,13 @@ class Common(Configuration):
     )
     # END MIDDLEWARE CONFIGURATION
 
+    # MIGRATIONS CONFIGURATION
+    MIGRATION_MODULES = {
+        'sites': 'contrib.sites.migrations'
+    }
+    # END MIGRATIONS CONFIGURATION
+
+
     # DEBUG
     # See: https://docs.djangoproject.com/en/dev/ref/settings/#debug
     DEBUG = values.BooleanValue(False)

{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/contrib/sites/migrations/0001_initial.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import django.contrib.sites.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Site',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('domain', models.CharField(max_length=100, verbose_name='domain name', validators=[django.contrib.sites.models._simple_domain_name_validator])),
+                ('name', models.CharField(max_length=50, verbose_name='display name')),
+            ],
+            options={
+                'ordering': ('domain',),
+                'db_table': 'django_site',
+                'verbose_name': 'site',
+                'verbose_name_plural': 'sites',
+            },
+            bases=(models.Model,),
+        ),
+    ]

{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/contrib/sites/migrations/0002_set_site_domain_and_name.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import models, migrations
+
+
+def update_site_forward(apps, schema_editor):
+    """Set site domain and name."""
+    Site = apps.get_model("sites", "Site")
+    Site.objects.update_or_create(
+        id=settings.SITE_ID,
+        defaults={
+            "domain": "{{cookiecutter.domain_name}}",
+            "name": "{{cookiecutter.project_name}}"
+        }
+    )
+
+
+def update_site_backward(apps, schema_editor):
+    """Revert site domain and name to default."""
+    Site = apps.get_model("sites", "Site")
+    Site.objects.update_or_create(
+        id=settings.SITE_ID,
+        defaults={
+            "domain": "example.com",
+            "name": "example.com"
+        }
+    )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sites', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_site_forward, update_site_backward),
+    ]

{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/users/migrations/0002_set_site_domain_and_name.py

@@ -1,35 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
-from django.conf import settings
-from django.db import models, migrations
-from django.apps import apps as django_apps
-
-
-def update_site_forward(apps, schema_editor):
-    """Set site domain and name."""
-    Site = django_apps.get_model("sites", "Site")
-    site = Site.objects.get(id=settings.SITE_ID)
-    site.domain = "{{cookiecutter.domain_name}}"
-    site.name = "{{cookiecutter.project_name}}"
-    site.save()
-
-
-def update_site_backward(apps, schema_editor):
-    """Revert site domain and name to default."""
-    Site = django_apps.get_model("sites", "Site")
-    site = Site.objects.get(id=settings.SITE_ID)
-    site.domain = 'example.com'
-    site.name = 'example.com'
-    site.save()
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('users', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.RunPython(update_site_forward, update_site_backward),
-    ]