Weird bug that my english is not enough to describe this.

[caner-cetin]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

so please fix the title after you got what I am saying

Example Code

from pydantic import BaseModel as Base

class Stash(Base):
    Name: str
    X: int
    Y: int

class Listing(Base):
    Method: str
    Indexed: datetime
    Stash: Stash
    Account: Account
    Price: Price

okay you see that stash? It is all okay. In the current state. Pyright doesnt bitch about anything, I can actually use this class.

lets dive into my mind for the past 1 hour

oh an error

Result.7.Listing.Stash
  Field required [type=missing, input_value={'Method': 'forum', 'Inde..., 'Currency': 'mirror'}}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.6/v/missing

I need to make this field optional. Alright, easy. Lets add Optional tag here...

Result.5.Listing.Stash
  Field required [type=missing, input_value={'Method': 'forum', 'Inde..., 'Currency': 'mirror'}}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.6/v/missing

grrrr.... Lets add Field(default=None)

class Listing(Base):
    Method: str
    Indexed: datetime
    Stash: Optional[Stash] = Field(default=None)
    Account: Account
    Price: Price

oh shit what the fuck

Type of "Stash" could not be determined because it refers to itself PylancereportGeneralTypeIssues
Variable not allowed in type expression PylancereportInvalidTypeForm
(variable) Stash: Unknown

uhhhh is the code running is it false warning

  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 82, in __repr__
    return f'{self.__repr_name__()}({self.__repr_str__(", ")})'
                                     ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 55, in __repr_str__
    return join_str.join(repr(v) if a is None else f'{a}={v!r}' for a, v in self.__repr_args__())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 55, in <genexpr>
    return join_str.join(repr(v) if a is None else f'{a}={v!r}' for a, v in self.__repr_args__())
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/fields.py", line 559, in __repr_args__
    yield 'annotation', _repr.PlainRepr(_repr.display_as_type(self.annotation))
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 103, in display_as_type
    args = ', '.join(map(display_as_type, typing_extensions.get_args(obj)))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 95, in display_as_type
    return repr(obj)
           ^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 82, in __repr__
    return f'{self.__repr_name__()}({self.__repr_str__(", ")})'
                                     ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 55, in __repr_str__
    return join_str.join(repr(v) if a is None else f'{a}={v!r}' for a, v in self.__repr_args__())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 55, in <genexpr>
    return join_str.join(repr(v) if a is None else f'{a}={v!r}' for a, v in self.__repr_args__())
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/fields.py", line 559, in __repr_args__
    yield 'annotation', _repr.PlainRepr(_repr.display_as_type(self.annotation))
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 103, in display_as_type
    args = ', '.join(map(display_as_type, typing_extensions.get_args(obj)))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic/_internal/_repr.py", line 95, in display_as_type
    return repr(obj)
           ^^^^^^^^^
RecursionError: maximum recursion depth exceeded while getting the repr of an object

AAAAAAAAA

Python, Pydantic & OS Version

pydantic version: 2.6.0
        pydantic-core version: 2.16.1
          pydantic-core build: profile=release pgo=true
                 install path: /Users/canercetin/Library/Caches/pypoetry/virtualenvs/zurna-backend-VoMrHkaz-py3.11/lib/python3.11/site-packages/pydantic
               python version: 3.11.7 (main, Dec  4 2023, 18:10:11) [Clang 15.0.0 (clang-1500.1.0.2.5)]
                     platform: macOS-14.2.1-arm64-arm-64bit
             related packages: typing_extensions-4.9.0 fastapi-0.109.1
                       commit: unknown

[caner-cetin]

StashRepr: Optional[Stash] = Field(default=None, alias="Stash")

I know that I can just fix this by adding alias but come on. Writing Stash everywhere would be hella cool to do.

[sydney-runkle]

@caner-cetin,

Right - we implemented this warning here: #8243, so this behavior is expected and intentional.

A field name can't be the same as the type used for the field. Using an alias here is a good workaround, if you really need the field to be named Stash!

[sydney-runkle]

Duplicate of #8240

[caner-cetin]

but come oooon, think how cool it would be to do without alias @sydney-runkle

[sydney-runkle]

@caner-cetin,

See an in depth explanation of this issue here: #7327

[caner-cetin]

everyone is against the cool things :(

jokes aside, thanks for reply and references.