Fix gallery model

apps/content/migrations/0012_auto_20180209_1847.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.0.2 on 2018-02-09 18:47
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0011_auto_20180209_1549'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='galleryimage',
+            name='gallery',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='gallery_images', to='content.Gallery', verbose_name='Галерея'),
+        ),
+    ]

apps/content/models.py

@@ -81,7 +81,7 @@ class Gallery(models.Model):
 class GalleryImage(models.Model):
     gallery = models.ForeignKey(
         Gallery, on_delete=models.CASCADE,
-        verbose_name='Галерея'
+        verbose_name='Галерея', related_name='gallery_images'
     )
     img = models.ForeignKey(
         ImageObject, related_name='gallery_images',