Functionality to convert field names on objects

Added the necessary functionality for translating fields to have
different names between the frontend and backend.

rest_framework/serializers.py

@@ -264,6 +264,15 @@ class BaseSerializer(WritableField):
         """
         return field_name
 
+    def get_field_name_map(self):
+        """
+        Return a map of serialized->python field names
+        """
+        ret = SortedDict()
+        for name, value in list(self.fields.items()):
+            ret[self.get_field_key(name)] = name
+        return ret
+
     def restore_fields(self, data, files):
         """
         Core of deserialization, together with `restore_object`.
@@ -275,10 +284,20 @@ class BaseSerializer(WritableField):
             self._errors['non_field_errors'] = ['Invalid data']
             return None
 
+        translated_data = SortedDict()
+        field_name_map = self.get_field_name_map()
+        for k,v in data.items():
+            try:
+                python_field = field_name_map[k]
+            except KeyError:
+                pass
+            else:
+                translated_data[python_field] = v
+
         for field_name, field in self.fields.items():
             field.initialize(parent=self, field_name=field_name)
             try:
-                field.field_from_native(data, files, field_name, reverted_data)
+                field.field_from_native(translated_data, files, field_name, reverted_data)
             except ValidationError as err:
                 self._errors[field_name] = list(err.messages)