Pydantic: allow arbitary types

[samuelcolvin]

Remove the exception pydantic.exceptions.ConfigError: no validator found for <class 'Foobar'> and just require that any value provided is an instance of Foobar.

[oldPadavan]

I'm not sure whether I understand the issue correctly. Does it cover the following case which raises exception mentioned by You?

from datetime import datetime
from typing import List
from pydantic import BaseModel

class MyClass:
    pass

class User(BaseModel):
    id: int
    name = 'John Doe'
    signup_ts: datetime = None
    friends: List[int] = []
    my: MyClass

external_data = {'id': '123', 'signup_ts': '2017-06-01 12:22', 'friends': [1, '2', b'3'], 'my': MyClass()}
user = User(**external_data)

[samuelcolvin]

Exactly the user case.

I guess we need a config variable to enable/disable this.

[Gr1N]

implemented in #209

[mr-bjerre]

Is this supposed to be fixed? I still get an error

[samuelcolvin]

Yes.

Are you using arbitrary_types_allowed = True?

[mr-bjerre]

Aha no. Where to set that? As an attribute to the class?

[samuelcolvin]

please read the documentation.

[mr-bjerre]

Do you mind pointing to where in the documentation? I didn’t find this thread by not looking. I was actively looking for it in the docs.

Well knowing the keyword arbitrary_types_allowed made the search easier. Thank you

[dmontagu]

@mr-bjerre A ctrl+f for arbitrary_types_allowed on the pydantic docs should get you to the right place.

Here's an demonstration that I believe should work (not tested):

from pydantic import BaseModel

class MyClass: 
    pass

class Model(BaseModel):
    v: MyClass

    class Config:
        arbitrary_types_allowed = True

[cknoll]

I was affected by this error and this thread (and especially the example by @dmontagu ) helped me solving it.

However:

@mr-bjerre A ctrl+f for arbitrary_types_allowed on the pydantic docs should get you to the right place.

Either I am surprisingly blind on this or something has changed: If I open the linked page in the docs https://pydantic-docs.helpmanual.io/ I cannot find anything for arbitrary_types_allowed or meaningful substrings. I also have not found a global search function. The only way I could find this in the docs was to manually open subpages which sound somehow relevant and using ctrl-f there. Result: https://pydantic-docs.helpmanual.io/usage/dataclasses/#use-custom-types.

Is there a better strategy to find the relevant section in the docs?

[mr-bjerre]

Its in the model congig section.

https://pydantic-docs.helpmanual.io/usage/model_config/