fix related name for placeholder fields

datacenterlight/cms_models.py

@@ -14,8 +14,12 @@ class CMSIntegration(models.Model):
             'fetch the Integration into pages'
         )
     )
-    footer_placeholder = PlaceholderField('datacenterlight_footer')
-    navbar_placeholder = PlaceholderField('datacenterlight_navbar')
+    footer_placeholder = PlaceholderField(
+        'datacenterlight_footer', related_name='dcl-footer-placeholder+'
+    )
+    navbar_placeholder = PlaceholderField(
+        'datacenterlight_navbar', related_name='dcl-navbar-placeholder+'
+    )
 
     def __str__(self):
         return self.name

datacenterlight/migrations/0017_auto_20180329_0056.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.4 on 2018-03-28 19:26
+from __future__ import unicode_literals
+
+import cms.models.fields
+from django.db import migrations
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('datacenterlight', '0016_cmsintegration'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cmsintegration',
+            name='footer_placeholder',
+            field=cms.models.fields.PlaceholderField(editable=False, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='dcl-footer-placeholder+', slotname='datacenterlight_footer', to='cms.Placeholder'),
+        ),
+        migrations.AlterField(
+            model_name='cmsintegration',
+            name='navbar_placeholder',
+            field=cms.models.fields.PlaceholderField(editable=False, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='dcl-navbar-placeholder+', slotname='datacenterlight_navbar', to='cms.Placeholder'),
+        ),
+    ]