Recursion error when generating schema #531
Description
Bug
For bugs/questions:
- OS: ubuntu 18.04
- Python version
import sys; print(sys.version): 3.7.3 - Pydantic version
import pydantic; print(pydantic.VERSION): 0.25
Running the code below to generate schema causes a recursion error.
from __future__ import annotations
import typing
from pydantic import BaseModel, Schema
class Account(BaseModel):
name: str
subaccounts: typing.List[Account] = []
Account.update_forward_refs()
print(Account.schema_json(indent=2))
...Snippet of recursion traceback
...
flat_models |= get_flat_models_from_model(field.type_)
File "/home/nav/.local/share/virtualenvs/project-oxBoBmI4/lib/python3.7/site-packages/pydantic/schema.py", line 355, in get_flat_models_from_model
flat_models |= get_flat_models_from_fields(fields)
File "/home/nav/.local/share/virtualenvs/project-oxBoBmI4/lib/python3.7/site-packages/pydantic/schema.py", line 394, in get_flat_models_from_fields
flat_models |= get_flat_models_from_field(field)
File "/home/nav/.local/share/virtualenvs/project-oxBoBmI4/lib/python3.7/site-packages/pydantic/schema.py", line 373, in get_flat_models_from_field
elif lenient_issubclass(field.type_, main.BaseModel):
File "/home/nav/.local/share/virtualenvs/project-oxBoBmI4/lib/python3.7/site-packages/pydantic/utils.py", line 232, in lenient_issubclass
return isinstance(cls, type) and issubclass(cls, class_or_tuple)
File "/home/nav/.local/share/virtualenvs/project-oxBoBmI4/lib/python3.7/abc.py", line 143, in __subclasscheck__
return _abc_subclasscheck(cls, subclass)
RecursionError: maximum recursion depth exceeded in comparison