Refactor REST API serializers to avoid circular imports

netbox/circuits/api/serializers_/providers.py

@@ -0,0 +1,67 @@
+from rest_framework import serializers
+
+from circuits.models import Provider, ProviderAccount, ProviderNetwork
+from ipam.api.nested_serializers import NestedASNSerializer
+from ipam.models import ASN
+from netbox.api.fields import RelatedObjectCountField, SerializedPKRelatedField
+from netbox.api.serializers import NetBoxModelSerializer
+from ..nested_serializers import *
+
+__all__ = (
+    'ProviderAccountSerializer',
+    'ProviderNetworkSerializer',
+    'ProviderSerializer',
+)
+
+
+class ProviderSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='circuits-api:provider-detail')
+    accounts = SerializedPKRelatedField(
+        queryset=ProviderAccount.objects.all(),
+        serializer=NestedProviderAccountSerializer,
+        required=False,
+        many=True
+    )
+    asns = SerializedPKRelatedField(
+        queryset=ASN.objects.all(),
+        serializer=NestedASNSerializer,
+        required=False,
+        many=True
+    )
+
+    # Related object counts
+    circuit_count = RelatedObjectCountField('circuits')
+
+    class Meta:
+        model = Provider
+        fields = [
+            'id', 'url', 'display', 'name', 'slug', 'accounts', 'description', 'comments', 'asns', 'tags',
+            'custom_fields', 'created', 'last_updated', 'circuit_count',
+        ]
+        brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'circuit_count')
+
+
+class ProviderAccountSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='circuits-api:provideraccount-detail')
+    provider = ProviderSerializer(nested=True)
+
+    class Meta:
+        model = ProviderAccount
+        fields = [
+            'id', 'url', 'display', 'provider', 'name', 'account', 'description', 'comments', 'tags', 'custom_fields',
+            'created', 'last_updated',
+        ]
+        brief_fields = ('id', 'url', 'display', 'name', 'account', 'description')
+
+
+class ProviderNetworkSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='circuits-api:providernetwork-detail')
+    provider = ProviderSerializer(nested=True)
+
+    class Meta:
+        model = ProviderNetwork
+        fields = [
+            'id', 'url', 'display', 'provider', 'name', 'service_id', 'description', 'comments', 'tags',
+            'custom_fields', 'created', 'last_updated',
+        ]
+        brief_fields = ('id', 'url', 'display', 'name', 'description')