RecursionError: maximum recursion depth exceeded while calling a Python object

[yourbuddyconner]

Hey there!

I am testing out ariadne-codegen against a TypeGraphQL-generated API and am seeing issues at runtime that look pretty similar to #100.

Traceback (most recent call last):
  File "/Users/connerswann/code/protege-engine-sdk-python/protege_engine/cli.py", line 2, in <module>
    from protege import Protege
  File "/Users/connerswann/code/protege-engine-sdk-python/protege_engine/protege.py", line 1, in <module>
    from api.client import Client
  File "/Users/connerswann/code/protege-engine-sdk-python/protege_engine/api/__init__.py", line 5, in <module>
    from .client import Client
  File "/Users/connerswann/code/protege-engine-sdk-python/protege_engine/api/client.py", line 12, in <module>
    from .input_types import (
  File "/Users/connerswann/code/protege-engine-sdk-python/protege_engine/api/input_types.py", line 2846, in <module>
    class UserCreateWithoutFeedbackInput(BaseModel):
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/_internal/_model_construction.py", line 182, in __new__
    complete_model_class(
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/_internal/_model_construction.py", line 491, in complete_model_class
    schema = cls.__get_pydantic_core_schema__(cls, handler)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/main.py", line 578, in __get_pydantic_core_schema__
    return __handler(__source)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/_internal/_schema_generation_shared.py", line 82, in __call__
    schema = self._handler(__source_type)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/_internal/_generate_schema.py", line 468, in generate_schema
    schema = self._generate_schema(obj)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/site-packages/pydantic/_internal/_generate_schema.py", line 700, in _gene
...
    ev_args = tuple(_eval_type(a, globalns, localns, recursive_guard) for a in t.__args__)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/typing.py", line 329, in <genexpr>
    ev_args = tuple(_eval_type(a, globalns, localns, recursive_guard) for a in t.__args__)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/typing.py", line 327, in _eval_type
    return t._evaluate(globalns, localns, recursive_guard)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/typing.py", line 693, in _evaluate
    type_ = _type_check(
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/typing.py", line 164, in _type_check
    arg = _type_convert(arg, module=module, allow_special_forms=allow_special_forms)
  File "/usr/local/Caskroom/miniconda/base/envs/protege-engine-sdk-python/lib/python3.10/typing.py", line 141, in _type_convert
    if isinstance(arg, str):
RecursionError: maximum recursion depth exceeded while calling a Python object

I have a node SDK which uses GraphQL Codegen that handles this API just fine so thinking there's a bug in this library somewhere that is interacting weirdly with my schema.

[mat-sop]

Hey, which version of ariadne-codegen are you using? Could you also provide the schema used to generate your client, or another schema that reproduces the exception?

[yourbuddyconner]

I updated the library I was using to 0.11 to be sure and it manifested the same behavior.

Unfortunately, this is an internal API I can't share details of publicly, but I am going to do some digging and review the schema and see what could be self-referential and revert back with thoughts.

[herman-mitish]

Hello! I am facing exactly the same issue with TypeGraphQL+Prisma generated API.
RecursionError: maximum recursion depth exceeded while calling a Python object
The only solution for me is to go back to 0.7.0, where it works ok, but every version above up until 0.11.0 would throw this error. I will try to provide simplified schema and example operation to reproduce

[herman-mitish]

I have made a small investigation, and it seems that starting from a certain level of complexity of the schema this error just happens. Though, this time I was able to get a little bit better error message:
RecursionError: maximum recursion depth exceeded in __instancecheck__

Most probably it could be resolved by setting higher recursion limit somewhere in the code, like:
import sys sys.setrecursionlimit(10000)

Here is a little reproduction I was able to make:
https://github.com/hermanmitish/ariadne-repro

[rafalp]

Thank you for this reproduction. I'll give it a look but just the "too big schema causes problems" observation seems to point that we need to change recursive algorithm to linear one 🤔

[yourbuddyconner]

Interesting... Poked this again today, and messed with the recursion limit setting -- still seeing a recursion error which indicates to me I might have a circular relationship in my DB schema, which theoretically should be fine because I set the field resolution depth to 3 on my backend, but I suspect it messes with the way you're rendering the pydantic types.

I suspect a switch to a linear algorithm might address both issues.