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RecursionError: maximum recursion depth exceeded while calling a Python object

See original GitHub issue

Describe the bug Trying to create code from an OpenAPI spec fails with a RecursionError.

To Reproduce

Example schema:

https://developer.here.com/documentation/routing-api/swagger/v8.yaml

Used commandline:

$ datamodel-codegen --url https://developer.here.com/documentation/routing-api/swagger/v8.yaml --input-file-type openapi --output result_model.py

Expected behavior No RecursionError

Version:

OS: Ubuntu 22.04
Python version: 3.8
datamodel-code-generator version: 0.13.0

Additional context

Not sure if the OpenAPI is defect or this package.

Traceback (most recent call last):
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/__main__.py", line 541, in main
    generate(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/__init__.py", line 367, in generate
    results = parser.parse()
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/base.py", line 449, in parse
    self.parse_raw()
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/openapi.py", line 393, in parse_raw
    self.parse_raw_obj(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1149, in parse_raw_obj
    self.parse_obj(name, JsonSchemaObject.parse_obj(raw), path)
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1164, in parse_obj
    self.parse_object(name, obj, path)
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 599, in parse_object
    fields=self.parse_object_fields(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 545, in parse_object_fields
    field_type = self.parse_item(modular_name, field, [*path, field_name])
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 645, in parse_item
    return self.parse_array_fields(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 753, in parse_array_fields
    data_types=self.parse_list_item(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 720, in parse_list_item
    return [
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 721, in <listcomp>
    self.parse_item(
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 639, in parse_item
    return self.get_ref_data_type(item.ref)
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/parser/jsonschema.py", line 436, in get_ref_data_type
    return self.data_type(reference=reference)
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/types.py", line 209, in __init__
    super().__init__(**values)
  File "/home/eifinger/.cache/pypoetry/virtualenvs/here-routing-cgjRCcGK-py3.8/lib/python3.8/site-packages/datamodel_code_generator/reference.py", line 45, in __init__
    super().__init__(**values)
  File "pydantic/main.py", line 339, in pydantic.main.BaseModel.__init__
  File "pydantic/main.py", line 1038, in pydantic.main.validate_model
  File "pydantic/fields.py", line 857, in pydantic.fields.ModelField.validate
  File "pydantic/fields.py", line 1074, in pydantic.fields.ModelField._validate_singleton
  File "pydantic/fields.py", line 1121, in pydantic.fields.ModelField._apply_validators
  File "pydantic/class_validators.py", line 313, in pydantic.class_validators._generic_validator_basic.lambda12
  File "pydantic/main.py", line 679, in pydantic.main.BaseModel.validate
  File "pydantic/main.py", line 605, in pydantic.main.BaseModel._copy_and_set_values
  File "/usr/lib/python3.8/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python3.8/copy.py", line 230, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib/python3.8/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/usr/lib/python3.8/copy.py", line 270, in _reconstruct
    state = deepcopy(state, memo)
  File "/usr/lib/python3.8/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python3.8/copy.py", line 230, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib/python3.8/copy.py", line 146, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python3.8/copy.py", line 205, in _deepcopy_list
    append(deepcopy(a, memo))
  File "/usr/lib/python3.8/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
...
RecursionError: maximum recursion depth exceeded while calling a Python object

Issue Analytics

State:
Created a year ago
Reactions:4
Comments:6 (1 by maintainers)

Top GitHub Comments

1reaction

eyalmor-entcommented, Aug 10, 2022

Also encountered this problem.

It seems like pydantic 1.9.1 added deepcopy to model validation:

Config.copy_on_model_validation does a deep copy and not a shallow one, https://github.com/samuelcolvin/pydantic/issues/3641 by @PrettyWood

(from the release notes)

This isn’t apparent in the datamodel-code-generator project because it’s currently locked on Pydantic 1.9.0.

The fix seems simple enough, hopefully I can a get a PR in today.

1reaction

eifingercommented, Jul 20, 2022

@pmbrull thank you doing that, pinning markupsafe==2.0.1 and following the fix from this link helped: https://github.com/koxudaxi/fastapi-code-generator/issues/232#issuecomment-1059146715

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