Fixes #1207: Include nested LAG serializer when showing interface connections (API)

netbox/dcim/api/serializers.py

@@ -618,10 +618,11 @@ class PeerInterfaceSerializer(serializers.ModelSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='dcim-api:interface-detail')
     device = NestedDeviceSerializer()
     form_factor = ChoiceFieldSerializer(choices=IFACE_FF_CHOICES)
+    lag = NestedInterfaceSerializer()
 
     class Meta:
         model = Interface
-        fields = ['id', 'url', 'device', 'name', 'form_factor', 'mac_address', 'mgmt_only', 'description']
+        fields = ['id', 'url', 'device', 'name', 'form_factor', 'lag', 'mac_address', 'mgmt_only', 'description']
 
 
 class WritableInterfaceSerializer(serializers.ModelSerializer):