Refactor REST API serializers to avoid circular imports

netbox/dcim/api/serializers_/manufacturers.py

@@ -0,0 +1,26 @@
+from rest_framework import serializers
+
+from dcim.models import Manufacturer
+from netbox.api.fields import RelatedObjectCountField
+from netbox.api.serializers import NetBoxModelSerializer
+
+__all__ = (
+    'ManufacturerSerializer',
+)
+
+
+class ManufacturerSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='dcim-api:manufacturer-detail')
+
+    # Related object counts
+    devicetype_count = RelatedObjectCountField('device_types')
+    inventoryitem_count = RelatedObjectCountField('inventory_items')
+    platform_count = RelatedObjectCountField('platforms')
+
+    class Meta:
+        model = Manufacturer
+        fields = [
+            'id', 'url', 'display', 'name', 'slug', 'description', 'tags', 'custom_fields', 'created', 'last_updated',
+            'devicetype_count', 'inventoryitem_count', 'platform_count',
+        ]
+        brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'devicetype_count')