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Showing content from https://github.com/pydantic/pydantic/issues/531 below:

Recursion error when generating schema · Issue #531 · pydantic/pydantic · GitHub

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

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