Related to #234, postponed annotations (PEP-563) also doesn't appear to be implemented. I think all that is needed here is a call to typing.get_type_hints().
from __future__ import annotations
from pydantic import BaseModel
from typing import Optional
class Foo(BaseModel):
foo: Optional[Foo]
Traceback (most recent call last):
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/validators.py", line 262, in find_validators
if issubclass(type_, val_type):
TypeError: issubclass() arg 1 must be a class
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/main.py", line 121, in __new__
config=config,
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/fields.py", line 107, in infer
schema=schema,
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/fields.py", line 87, in __init__
self.prepare()
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/fields.py", line 136, in prepare
self._populate_validators()
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/fields.py", line 266, in _populate_validators
self.model_config.arbitrary_types_allowed)),
File "/home/buhman/env/lib/python3.7/site-packages/pydantic/validators.py", line 265, in find_validators
raise RuntimeError(f'error checking inheritance of {type_!r} (type: {display_as_type(type_)})') from e
RuntimeError: error checking inheritance of 'Optional[Foo]' (type: str)
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