Refactor REST API serializers to avoid circular imports

netbox/core/api/serializers_/data.py

@@ -0,0 +1,53 @@
+from rest_framework import serializers
+
+from core.choices import *
+from core.models import DataFile, DataSource
+from netbox.api.fields import ChoiceField, RelatedObjectCountField
+from netbox.api.serializers import NetBoxModelSerializer
+from netbox.utils import get_data_backend_choices
+
+__all__ = (
+    'DataFileSerializer',
+    'DataSourceSerializer',
+)
+
+
+class DataSourceSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(
+        view_name='core-api:datasource-detail'
+    )
+    type = ChoiceField(
+        choices=get_data_backend_choices()
+    )
+    status = ChoiceField(
+        choices=DataSourceStatusChoices,
+        read_only=True
+    )
+
+    # Related object counts
+    file_count = RelatedObjectCountField('datafiles')
+
+    class Meta:
+        model = DataSource
+        fields = [
+            'id', 'url', 'display', 'name', 'type', 'source_url', 'enabled', 'status', 'description', 'comments',
+            'parameters', 'ignore_rules', 'custom_fields', 'created', 'last_updated', 'file_count',
+        ]
+        brief_fields = ('id', 'url', 'display', 'name', 'description')
+
+
+class DataFileSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(
+        view_name='core-api:datafile-detail'
+    )
+    source = DataSourceSerializer(
+        nested=True,
+        read_only=True
+    )
+
+    class Meta:
+        model = DataFile
+        fields = [
+            'id', 'url', 'display', 'source', 'path', 'last_updated', 'size', 'hash',
+        ]
+        brief_fields = ('id', 'url', 'display', 'path')