Parsing fails with mixture of classes and dataclasses #569
Description
🐛 Bug report
Validation fails when there is a union of dataclass and regular classes.
To reproduce (Updated Example)
Create cli.py:
from dataclasses import dataclass
from typing import Dict, Optional, Union
from jsonargparse import CLI
@dataclass
class MyData:
val_a: Optional[str] = None
val_b: Optional[str] = None
class MyClass:
def __init__(self, val_1: str, val_2: str):
self.val_1 = val_1
self.val_2 = val_2
class MyContainer:
def __init__(self, value: Union[MyData, MyClass]):
self.value = value
def command(mycontainer: Optional[MyContainer] =[]) -> None:
print("Success")
if __name__ == '__main__':
CLI(command)
And config.yaml file:
mycontainer:
class_path: MyContainer
init_args:
value:
class_path: MyClass
init_args:
val_1: "A"
val_2: "B"
Run the command:
python cli.py --config config.yaml
The following error results:
usage: cli.py [-h] [--config CONFIG] [--print_config[=flags]] [--mycontainer.help CLASS_PATH_OR_NAME] [--mycontainer MYCONTAINER]
[--print_shtab {bash,zsh,tcsh}]
error: Validation failed: Parser key "mycontainer":
Does not validate against any of the Union subtypes
Subtypes: (<class '__main__.MyContainer'>, <class 'NoneType'>)
Errors:
- Problem with given class_path '__main__.MyContainer':
Parser key "value":
Does not validate against any of the Union subtypes
Subtypes: (<class '__main__.MyData'>, <class '__main__.MyClass'>)
Errors:
- No action for key "class_path" to set its default.
- Not a valid subclass of MyClass
Subclass types expect one of:
- a class path (str)
- a dict with class_path entry
- a dict without class_path but with init_args entry (class path given previously)
Given value type: <class 'jsonargparse._namespace.Namespace'>
Given value: Namespace(val_a=None, val_b=None, class_path='MyClass', init_args=Namespace(val_1='A', val_2='B'))
- Expected a <class 'NoneType'>
Given value type: <class 'jsonargparse._namespace.Namespace'>
Given value: Namespace(class_path='__main__.MyContainer', init_args=Namespace(value=Namespace(val_a=None, val_b=None, class_path='MyClass', init_args=Namespace(val_1='A', val_2='B'))))
It should print "Success".
If the Union[MyData, MyClass] is replaced with Union[MyClass], then it is successful.
Environment
- jsonargparse version: 4.32.1
- Python version: 3.10.13
- How jsonargparse was installed:
pip install "jsonargparse[all]>=4.27.7" - OS: Ubuntu 24.04 LTS