fix + test

pydantic · Jan 9, 2024 · 58cbceb · 58cbceb
1 parent 820a54a
commit 58cbceb
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/pydantic/main.py b/pydantic/main.py
@@ -238,7 +238,7 @@ def model_construct(cls: type[Model], _fields_set: set[str] | None = None, **val
         if cls.__pydantic_post_init__:
             m.model_post_init(None)
             # update private attributes with values set
-            if m.__pydantic_private__ is not None:
+            if hasattr(m, '__pydantic_private__') and m.__pydantic_private__ is not None:
                 for k, v in values.items():
                     if k in m.__private_attributes__:
                         m.__pydantic_private__[k] = v

diff --git a/tests/test_construction.py b/tests/test_construction.py
@@ -519,3 +519,13 @@ class MyModel(BaseModel):
     m = MyModel.model_construct(b='b')
 
     assert m.model_dump_json() == '{"a":"a","b":"b"}'
+
+
+def test_initialize_with_private_attr():
+    class MyModel(BaseModel):
+        _a: str
+
+    m = MyModel.model_construct(_a='a')
+
+    assert m._a == 'a'
+    assert '_a' in m.__pydantic_private__