Add migration and new field for images

opentech/images/migrations/0003_customimage_drupal_id.py

+# Generated by Django 2.0.2 on 2018-08-29 12:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('images', '0002_customimage_file_hash'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='customimage',
+            name='drupal_id',
+            field=models.IntegerField(blank=True, editable=False, null=True),
+        ),
+    ]

opentech/images/models.py

@@ -9,6 +9,8 @@ from wagtail.images.models import (
 # We define our own custom image class to replace wagtailimages.Image,
 # providing various additional data fields
 class CustomImage(AbstractImage):
+    drupal_id = models.IntegerField(null=True, blank=True, editable=False)
+
     alt = models.CharField(max_length=255, blank=True)
     credit = models.CharField(max_length=255, blank=True)