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arbitrary_types_allowed does not propagate to the model which is created for a NamedTuple #4219

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rorybyrne opened this issue Jul 7, 2022 · 1 comment · Fixed by #4225
3 tasks done
bug V1 Bug related to Pydantic V1.X


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rorybyrne commented Jul 7, 2022


  • I added a descriptive title to this issue
  • I have searched (google, github) for similar issues and couldn't find anything
  • I have read and followed the docs and still think this is a bug


When using a NamedTuple as a field in a pydantic model, it cannot have arbitrary types - even if arbitrary_types_allowed is True on the model. I found that when create_model_from_namedtuple is called, config is not passed (but for TypedDict, it is passed).

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.9.1
            pydantic compiled: True
                 install path: /home/rory/lab/mres/task/co/.venv/lib/python3.9/site-packages/pydantic
               python version: 3.9.13 (main, May 27 2022, 11:07:19)  [GCC 12.1.0]
                     platform: Linux-5.18.7-arch1-1-x86_64-with-glibc2.35
     optional deps. installed: ['typing-extensions']
from typing import NamedTuple
import pydantic

class Foo:

class Bar(NamedTuple):
    foo: Foo

class MyModel(pydantic.BaseModel):
    bar: Bar

    class Config:
        arbitrary_types_allowed = True


@rorybyrne rorybyrne added the bug V1 Bug related to Pydantic V1.X label Jul 7, 2022
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rorybyrne commented Jul 7, 2022

I could open a PR for this? Looks like a quick change here to pass config.

I made a fix here, can PR it if someone gives the green light (tests are passing)

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bug V1 Bug related to Pydantic V1.X
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