8000 Attribute cannot have the same name as its type · Issue #117 · pydantic/pydantic · GitHub
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catethos opened this issue Jan 13, 2018 · 2 comments
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Attribute cannot have the same name as its type #117

catethos opened this issue Jan 13, 2018 · 2 comments

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@catethos
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I am trying to make the class attribute having the same name as its type. The following code does not work and show the ConfigError

class A(BaseModel):
    pass

class B(BaseModel):
    A: A = None

ConfigError: unable to infer type for attribute "A"

However, if I make the attribute no default value then it works

class A(BaseModel):
    pass

class B(BaseModel):
    A: A

Is this behavior intended?
@samuelcolvin
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samuelcolvin commented Jan 13, 2018 •
edited
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This is a consequence of how python annotations work and not specific to pydantic:

In [1]: class Foo:
   ...:     pass
   ...: 

In [2]: class Bar:
   ...:     Foo: Foo = None
   ...:     spam: str = None
   ...:     

In [3]: Bar.__annotations__
Out[3]: {'Foo': None, 'spam': str}

I've no idea if this is intentional behaviour or a bug in the standard library but there's nothing pydantic can do about it since it's just consulting the __annotations__ dict and finding None.

@hb2638
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hb2638 commented Jan 26, 2023 •
edited
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This is related to python/mypy#1775
I ended up using an alias

so using your example

before

class A(BaseModel):
    pass

class B(BaseModel):
    A: A = None

after

class A(BaseModel):
    pass

_A = A

class B(BaseModel):
    A: _A = None

alexdrydew pushed a commit to alexdrydew/pydantic that referenced this issue Dec 23, 2023
@samuelcolvin
check items() exists before calling it a mapping (pydantic#117)
ee7d0c4 
* check items() exists before calling it a mapping

* linting
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@samuelcolvin @catethos @hb2638
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