I expected this would do something sane:
from pydantic import BaseModel
from typing import Optional, ForwardRef
Foo = ForwardRef('Foo')
class Foo(BaseModel):
foo: Optional[Foo]
Instead it does not:
Traceback (most recent call last):
File "./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 "./test.py", line 6, in <module>
class Foo(BaseModel):
File "./lib/python3.7/site-packages/pydantic/main.py", line 120, in __new__
config=config,
File "./lib/python3.7/site-packages/pydantic/fields.py", line 105, in infer
schema=schema,
File "./lib/python3.7/site-packages/pydantic/fields.py", line 85, in __init__
self.prepare()
File "./lib/python3.7/site-packages/pydantic/fields.py", line 133, in prepare
self._populate_sub_fields()
File "./lib/python3.7/site-packages/pydantic/fields.py", line 177, in _populate_sub_fields
) for t in types_]
File "./lib/python3.7/site-packages/pydantic/fields.py", line 177, in <listcomp>
) for t in types_]
File "./lib/python3.7/site-packages/pydantic/fields.py", line 85, in __init__
self.prepare()
File "./lib/python3.7/site-packages/pydantic/fields.py", line 134, in prepare
self._populate_validators()
File "./lib/python3.7/site-packages/pydantic/fields.py", line 217, in _populate_validators
self.model_config.arbitrary_types_allowed)),
File "./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 ForwardRef('Foo') (type: ForwardRef('Foo'))
It looks like ForwardRef isn't resolved (and can't be, in this case, because it isn't defined yet).
gangefors, koliyo, mastergenius, demosdemon and bykof
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