Similar to #397, I'm using Python 3.7, importing annotations, and have a dataclass with a field that stores an optional instance of the same class.
This works fine under dataclasses.dataclass but fails under pydantic.dataclasses.dataclass:
For bugs/questions:
3.7.3 (default, Apr 20 2019, 07:46:47) : ?0.31: ?from __future__ import annotations
from typing import Optional
from pydantic.dataclasses import dataclass
@dataclass
class Resource:
parent: Optional[Resource] = None
print(Resource())
...yields:
pydantic.errors.ConfigError: field "parent" not yet prepared so type is still a ForwardRef, you might need to call MetaModel.update_forward_refs().
I can solve it by adding above the class Resource=ForwardRef('Resource') but ForwardRef is private (not in typing.__all__) so I get a warning.
I'll continue by suppressing the warning. Just curious if I'm approaching this wrong.
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