Implemented API endpoints for ImageAttachments

netbox/extras/api/serializers.py

@@ -1,9 +1,14 @@
 from rest_framework import serializers
 
-from dcim.api.serializers import NestedSiteSerializer
-from extras.models import ACTION_CHOICES, Graph, GRAPH_TYPE_CHOICES, ExportTemplate, TopologyMap, UserAction
+from django.core.exceptions import ObjectDoesNotExist
+
+from dcim.api.serializers import NestedDeviceSerializer, NestedRackSerializer, NestedSiteSerializer
+from dcim.models import Device, Rack, Site
+from extras.models import (
+    ACTION_CHOICES, ExportTemplate, Graph, GRAPH_TYPE_CHOICES, ImageAttachment, TopologyMap, UserAction,
+)
 from users.api.serializers import NestedUserSerializer
-from utilities.api import ChoiceFieldSerializer
+from utilities.api import ChoiceFieldSerializer, ContentTypeFieldSerializer
 
 
 #
@@ -71,6 +76,52 @@ class WritableTopologyMapSerializer(serializers.ModelSerializer):
         fields = ['id', 'name', 'slug', 'site', 'device_patterns', 'description']
 
 
+#
+# Image attachments
+#
+
+class ImageAttachmentSerializer(serializers.ModelSerializer):
+    parent = serializers.SerializerMethodField()
+
+    class Meta:
+        model = ImageAttachment
+        fields = ['id', 'parent', 'name', 'image', 'image_height', 'image_width', 'created']
+
+    def get_parent(self, obj):
+
+        # Static mapping of models to their nested serializers
+        if isinstance(obj.parent, Device):
+            serializer = NestedDeviceSerializer
+        elif isinstance(obj.parent, Rack):
+            serializer = NestedRackSerializer
+        elif isinstance(obj.parent, Site):
+            serializer = NestedSiteSerializer
+        else:
+            raise Exception("Unexpected type of parent object for ImageAttachment")
+
+        return serializer(obj.parent, context={'request': self.context['request']}).data
+
+
+class WritableImageAttachmentSerializer(serializers.ModelSerializer):
+    content_type = ContentTypeFieldSerializer()
+
+    class Meta:
+        model = ImageAttachment
+        fields = ['id', 'content_type', 'object_id', 'name', 'image']
+
+    def validate(self, data):
+
+        # Validate that the parent object exists
+        try:
+            data['content_type'].get_object_for_this_type(id=data['object_id'])
+        except ObjectDoesNotExist:
+            raise serializers.ValidationError(
+                "Invalid parent object: {} ID {}".format(data['content_type'], data['object_id'])
+            )
+
+        return data
+
+
 #
 # User actions
 #