Edge case of field(default=False, init=False)

[carmocca]

🐛 Bug report

Hello Mauricio!

Here's an edge case for you

  File "/home/ubuntu/carlos/stuff/kk.py", line 12, in <module>
    print(CLI(Bar))
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_cli.py", line 88, in CLI
    _add_component_to_parser(components, parser, as_positional, fail_untyped, config_help)
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_cli.py", line 169, in _add_component_to_parser
    added_args = parser.add_class_arguments(component, as_group=False, **kwargs)
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_signatures.py", line 107, in add_class_arguments
    added_args = self._add_signature_arguments(
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_signatures.py", line 308, in _add_signature_arguments
    self._add_signature_parameter(
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_signatures.py", line 434, in _add_signature_parameter
    action = container.add_argument(*args, **kwargs)
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_core.py", line 130, in add_argument
    self.add_class_arguments(kwargs.pop("type"), nested_key, **kwargs)
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_signatures.py", line 133, in add_class_arguments
    self.set_defaults(**defaults)  # type: ignore[attr-defined]
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_core.py", line 207, in set_defaults
    self.set_defaults(kwargs)
  File "/home/ubuntu/.pyenv/versions/env/lib/python3.10/site-packages/jsonargparse/_core.py", line 196, in set_defaults
    raise NSKeyError(f'No action for key "{dest}" to set its default.')
jsonargparse._namespace.NSKeyError: No action for key "metrics.x" to set its default.

To reproduce

from dataclasses import dataclass, field
from jsonargparse import CLI

@dataclass
class Foo:
    x: bool = field(default=False, init=False)

@dataclass
class Bar:
    metrics: Foo = field(default_factory=Foo)

print(CLI(Bar))

Motivation

I have a dataclass with dataclasses
I want to add fields that are not part of the init
I cannot use __post_init__ instead because it will be frozen (not included in the snippet above)

Expected behavior

Works as expected

Environment

• jsonargparse version: 4.35.0
• Python version: 3.10.12
• How jsonargparse was installed: pip
• OS: Linux

As always, thank you for this great tool 🙇

[mauvilsa]

Thank you for reporting!