fix bug

@@ -29,6 +29,12 @@ class CustomDate(fields.Date):
         return value
 
 
+class CustomDecimal(fields.Decimal):
+
+    def _deserialize(self, value, attr, data, **kwargs):
+        return self._to_string(self._validated(value))
+
+
 # restframework将request.body封装至request.data, webargs从request.data中获取参数
 @parser.location_loader("data")
 def load_data(request, schema):