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dataclasses.InitVar not supported #592

pfrederiks opened this issue Jun 13, 2019 · 0 comments


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commented Jun 13, 2019


When a dataclass contains an InitVar field, pydantic will try to validate it and does not pass the InitVar to post_init.

Using InitVar will raise the following error:

RuntimeError: no validator found for <class 'dataclasses.InitVar'>

And when arbitrary_types_allowed is set the following exception is raised:

TypeError: _pydantic_post_init() takes 1 positional argument but 2 were given

I have a pull request.

For bugs/questions:

  • OS: any
  • Python version: 3.7
  • Pydantic version : 0.28

@pfrederiks pfrederiks referenced this issue Jun 13, 2019


Add support for InitVar #591

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