Update images_count field migration

app/migrations/0026_update_images_count.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.1 on 2017-07-07 18:05
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def update_images_count(apps, schema_editor):
+    Task = apps.get_model('app', 'Task')
+
+    for t in Task.objects.all():
+        print("Updating {}".format(t))
+        t.images_count = t.imageupload_set.count()
+        t.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('app', '0025_auto_20190220_1854'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_images_count),
+    ]