Pydantic: Explicit validator in parent class breaks type validation in child class for nested types

[AlbertMukhammadiev]

Question

Please complete:

• OS: Ubuntu 18.04
• Python version import sys; print(sys.version): 3.6.8 [GCC 7.4.0]
• Pydantic version import pydantic; print(pydantic.VERSION): 1.2a1

Hello, I'm trying to create an instance of class Bar.

import pydantic
from typing import List


class Foo(pydantic.BaseModel):
    foo: List[List[int]]

    @pydantic.validator('foo')
    def check_something(cls, value):
        return value


class Bar(Foo):
    pass


foo_ = [[0, 1]]
Foo(foo=foo_)
Bar(foo=foo_)

Output:

pydantic.error_wrappers.ValidationError: 1 validation error for Bar
foo -> 0
  value is not a valid integer (type=type_error.integer)

There will be no error, If you remove validator.

[samuelcolvin]

Confirmed, thanks for reporting. Has been this way since v1.

I'll try and fix forthwith.

[samuelcolvin]

should be fixed via #1016, please let me know if that solves your problem. If so I'll release it as v1.1.1

[AlbertMukhammadiev]

Great! Thank you for the quick response!