Closes #7812: Enable change logging for image attachments

docs/release-notes/version-3.1.md

@@ -11,6 +11,7 @@
 * [#7761](https://github.com/netbox-community/netbox/issues/7761) - Extend cable tracing across bridged interfaces
 * [#7769](https://github.com/netbox-community/netbox/issues/7769) - Enable assignment of IP addresses to an existing FHRP group
 * [#7775](https://github.com/netbox-community/netbox/issues/7775) - Enable dynamic config for `CHANGELOG_RETENTION`, `CUSTOM_VALIDATORS`, and `GRAPHQL_ENABLED`
+* [#7812](https://github.com/netbox-community/netbox/issues/7812) - Enable change logging for image attachments
 * [#7858](https://github.com/netbox-community/netbox/issues/7858) - Standardize the representation of content types across import & export functions
 
 ### Bug Fixes
@@ -22,6 +23,11 @@
 * [#7771](https://github.com/netbox-community/netbox/issues/7771) - Group assignment should be optional when creating contacts via REST API
 * [#7849](https://github.com/netbox-community/netbox/issues/7849) - Fix exception when creating an FHRPGroup with an invalid IP address
 
+### REST API Changes
+
+* extras.ImageAttachment
+    * Added the `last_updated` field
+
 ---
 
 ## v3.1-beta1 (2021-11-05)

netbox/extras/api/serializers.py

@@ -150,7 +150,7 @@ class ImageAttachmentSerializer(ValidatedModelSerializer):
         model = ImageAttachment
         fields = [
             'id', 'url', 'display', 'content_type', 'object_id', 'parent', 'name', 'image', 'image_height',
-            'image_width', 'created',
+            'image_width', 'created', 'last_updated',
         ]
 
     def validate(self, data):

netbox/extras/migrations/0065_imageattachment_change_logging.py

@@ -0,0 +1,16 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '0064_configrevision'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='imageattachment',
+            name='last_updated',
+            field=models.DateTimeField(auto_now=True, null=True),
+        ),
+    ]

netbox/extras/models/models.py

@@ -317,7 +317,8 @@ class ExportTemplate(ChangeLoggedModel):
         return response
 
 
-class ImageAttachment(BigIDModel):
+@extras_features('webhooks')
+class ImageAttachment(ChangeLoggedModel):
     """
     An uploaded image which is associated with an object.
     """
@@ -341,6 +342,7 @@ class ImageAttachment(BigIDModel):
         max_length=50,
         blank=True
     )
+    # ChangeLoggingMixin.created is a DateField
     created = models.DateTimeField(
         auto_now_add=True
     )
@@ -390,6 +392,9 @@ class ImageAttachment(BigIDModel):
         except tuple(expected_exceptions):
             return None
 
+    def to_objectchange(self, action):
+        return super().to_objectchange(action, related_object=self.parent)
+
 
 @extras_features('webhooks')
 class JournalEntry(ChangeLoggedModel):