Refactor REST API serializers to avoid circular imports

netbox/extras/api/serializers_/bookmarks.py

@@ -0,0 +1,35 @@
+from drf_spectacular.utils import extend_schema_field
+from rest_framework import serializers
+
+from core.models import ContentType
+from extras.models import Bookmark
+from netbox.api.fields import ContentTypeField
+from netbox.api.serializers import ValidatedModelSerializer
+from netbox.constants import NESTED_SERIALIZER_PREFIX
+from users.api.serializers_.users import UserSerializer
+from utilities.api import get_serializer_for_model
+
+__all__ = (
+    'BookmarkSerializer',
+)
+
+
+class BookmarkSerializer(ValidatedModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='extras-api:bookmark-detail')
+    object_type = ContentTypeField(
+        queryset=ContentType.objects.with_feature('bookmarks'),
+    )
+    object = serializers.SerializerMethodField(read_only=True)
+    user = UserSerializer(nested=True)
+
+    class Meta:
+        model = Bookmark
+        fields = [
+            'id', 'url', 'display', 'object_type', 'object_id', 'object', 'user', 'created',
+        ]
+        brief_fields = ('id', 'url', 'display', 'object_id', 'object_type')
+
+    @extend_schema_field(serializers.JSONField(allow_null=True))
+    def get_object(self, instance):
+        serializer = get_serializer_for_model(instance.object, prefix=NESTED_SERIALIZER_PREFIX)
+        return serializer(instance.object, context={'request': self.context['request']}).data