Added child counts to API serializers (WIP)

netbox/virtualization/api/nested_serializers.py

@@ -19,26 +19,29 @@ __all__ = [
 
 class NestedClusterTypeSerializer(WritableNestedSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='virtualization-api:clustertype-detail')
+    cluster_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = ClusterType
-        fields = ['id', 'url', 'name', 'slug']
+        fields = ['id', 'url', 'name', 'slug', 'cluster_count']
 
 
 class NestedClusterGroupSerializer(WritableNestedSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='virtualization-api:clustergroup-detail')
+    cluster_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = ClusterGroup
-        fields = ['id', 'url', 'name', 'slug']
+        fields = ['id', 'url', 'name', 'slug', 'cluster_count']
 
 
 class NestedClusterSerializer(WritableNestedSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='virtualization-api:cluster-detail')
+    virtualmachine_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = Cluster
-        fields = ['id', 'url', 'name']
+        fields = ['id', 'url', 'name', 'virtualmachine_count']
 
 
 #

netbox/virtualization/api/serializers.py

@@ -20,17 +20,19 @@ from .nested_serializers import *
 #
 
 class ClusterTypeSerializer(ValidatedModelSerializer):
+    cluster_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = ClusterType
-        fields = ['id', 'name', 'slug']
+        fields = ['id', 'name', 'slug', 'cluster_count']
 
 
 class ClusterGroupSerializer(ValidatedModelSerializer):
+    cluster_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = ClusterGroup
-        fields = ['id', 'name', 'slug']
+        fields = ['id', 'name', 'slug', 'cluster_count']
 
 
 class ClusterSerializer(TaggitSerializer, CustomFieldModelSerializer):
@@ -38,11 +40,13 @@ class ClusterSerializer(TaggitSerializer, CustomFieldModelSerializer):
     group = NestedClusterGroupSerializer(required=False, allow_null=True)
     site = NestedSiteSerializer(required=False, allow_null=True)
     tags = TagListSerializerField(required=False)
+    virtualmachine_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = Cluster
         fields = [
             'id', 'name', 'type', 'group', 'site', 'comments', 'tags', 'custom_fields', 'created', 'last_updated',
+            'virtualmachine_count',
         ]
 
 

netbox/virtualization/api/views.py

@@ -1,3 +1,5 @@
+from django.db.models import Count
+
 from dcim.models import Interface
 from extras.api.views import CustomFieldModelViewSet
 from utilities.api import FieldChoicesViewSet, ModelViewSet
@@ -21,19 +23,25 @@ class VirtualizationFieldChoicesViewSet(FieldChoicesViewSet):
 #
 
 class ClusterTypeViewSet(ModelViewSet):
-    queryset = ClusterType.objects.all()
+    queryset = ClusterType.objects.annotate(
+        cluster_count=Count('clusters')
+    )
     serializer_class = serializers.ClusterTypeSerializer
     filterset_class = filters.ClusterTypeFilter
 
 
 class ClusterGroupViewSet(ModelViewSet):
-    queryset = ClusterGroup.objects.all()
+    queryset = ClusterGroup.objects.annotate(
+        cluster_count=Count('clusters')
+    )
     serializer_class = serializers.ClusterGroupSerializer
     filterset_class = filters.ClusterGroupFilter
 
 
 class ClusterViewSet(CustomFieldModelViewSet):
-    queryset = Cluster.objects.select_related('type', 'group').prefetch_related('tags')
+    queryset = Cluster.objects.select_related('type', 'group').prefetch_related('tags').annotate(
+        virtualmachine_count=Count('virtual_machines')
+    )
     serializer_class = serializers.ClusterSerializer
     filterset_class = filters.ClusterFilter