Add Serializer class

joey/serializers.py

@@ -0,0 +1,23 @@
+from pydantic import BaseModel, Field
+from pydantic.main import ModelMetaclass
+from pydantic.utils import GetterDict
+from typing import List, Optional, Any
+
+
+class NestedGetterDict(GetterDict):
+    def get(self, key: Any, default: Any = None):
+        res = self._obj
+        for s in key.split('.'):
+            res = getattr(res, s, default)
+        return res
+
+
+class SerializerMetaclass(ModelMetaclass):
+    def __call__(cls, obj):
+        return cls.from_orm(obj)
+
+
+class Serializer(BaseModel, metaclass=ModelMetaclass):
+    class Config:
+        orm_mode = True
+        getter_dict = NestedGetterDict