#3234 exclude extra field when represent model (#3241)

* exclude extra field when represent model

* add test code

* fix W293

* add change md

* Update changes/3234-cocolman.md

Co-authored-by: Samuel Colvin <samcolvin@gmail.com>

* Update pydantic/main.py

Co-authored-by: Samuel Colvin <samcolvin@gmail.com>

* Update tests/test_main.py

Co-authored-by: Samuel Colvin <samcolvin@gmail.com>

Co-authored-by: Samuel Colvin <samcolvin@gmail.com>

changes/3234-cocolman.md

@@ -0,0 +1 @@
+Fix display of `extra` fields with model `__repr__`

pydantic/main.py

@@ -873,7 +873,9 @@ def __eq__(self, other: Any) -> bool:
             return self.dict() == other
 
     def __repr_args__(self) -> 'ReprArgs':
-        return [(k, v) for k, v in self.__dict__.items() if self.__fields__[k].field_info.repr]
+        return [
+            (k, v) for k, v in self.__dict__.items() if k not in self.__fields__ or self.__fields__[k].field_info.repr
+        ]
 
 
 _is_base_model_class_defined = True

tests/test_main.py

@@ -208,6 +208,16 @@ class Config:
     assert Model(a='10.2', b=12).dict() == {'a': 10.2, 'b': 12}
 
 
+def test_allow_extra_repr():
+    class Model(BaseModel):
+        a: float = ...
+
+        class Config:
+            extra = Extra.allow
+
+    assert str(Model(a='10.2', b=12)) == 'a=10.2 b=12'
+
+
 def test_forbidden_extra_success():
     class ForbiddenExtra(BaseModel):
         foo = 'whatever'