diff --git a/spectree/models.py b/spectree/models.py
index b7ef058..253bba7 100644
--- a/spectree/models.py
+++ b/spectree/models.py
@@ -125,6 +125,7 @@ def check_type_required_fields(cls, values: dict):
 
     class Config:
         validate_assignment = True
+        allow_population_by_field_name=True
 
 
 class SecurityScheme(BaseModel):