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Validator isn't called when Optional is set #132

xunto opened this Issue Feb 12, 2018 · 1 comment


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xunto commented Feb 12, 2018

Hi there. I think there is a bug. What I'm trying to do is to check if atleast one of two properties (login or dn) exists. But I if set them optional, validator is never called.

This example doesn't raise exception.

from typing import Optional

import pydantic
from pydantic import validator

class Authentication(pydantic.BaseModel):
    login: Optional[str]
    dn: Optional[str]

    password: str

    @validator('login', "dn", always=True, pre=True)
    def auth_specified(cls, value, values, **kwargs):
        if not value and not {"login", "dn"}.intersection(values.keys()):
            raise ValueError("No auth specified")
        return value


Checked on github master branch.


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samuelcolvin commented Feb 14, 2018

Thanks for reporting. I think this is the same problem I was trying to fix with #118.

The problem is, it took a big rewrite to fix. I'll have another go and see if I can find a way of fixing this without adversely effecting performance or current functionality.

@samuelcolvin samuelcolvin added the bug label Feb 28, 2018

@samuelcolvin samuelcolvin referenced this issue Mar 25, 2018


Version 1 Release #143

7 of 8 tasks complete

samuelcolvin added a commit that referenced this issue Dec 28, 2018

@samuelcolvin samuelcolvin referenced this issue Dec 28, 2018


allow validate_always with default=None #344

5 of 5 tasks complete

samuelcolvin added a commit that referenced this issue Dec 29, 2018

allow validate_always with default=None (#344)
* allow validate alwasy with None, fix #132

* prevent whole validators being called on subitems

* improve Optional validators edge cases
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