fix: Fix JSON serialization error of ApiModel in print_obj

[PythonicVarun]

When running model-related CLI commands such as:

kaggle models get kienngx/nemotron-nano-30b-trained

The command fails with the following traceback:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\PythonicVarun\tmp\.venv\Scripts\kaggle.exe\__main__.py", line 10, in <module>
  File "C:\PythonicVarun\tmp\.venv\Lib\site-packages\kaggle\cli.py", line 75, in main
    out = args.func(**command_args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\PythonicVarun\tmp\.venv\Lib\site-packages\kaggle\api\kaggle_api_extended.py", line 4800, in model_get_cli
    self.print_obj(model)
  File "C:\PythonicVarun\tmp\.venv\Lib\site-packages\kaggle\api\kaggle_api_extended.py", line 5877, in print_obj
    pretty = json.dumps(obj, indent=indent)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Development\Python\Python312\Lib\json\__init__.py", line 238, in dumps
    **kw).encode(obj)
          ^^^^^^^^^^^
  File "C:\Development\Python\Python312\Lib\json\encoder.py", line 202, in encode
    chunks = list(chunks)
             ^^^^^^^^^^^^
  File "C:\Development\Python\Python312\Lib\json\encoder.py", line 439, in _iterencode
    o = _default(o)
        ^^^^^^^^^^^
  File "C:\Development\Python\Python312\Lib\json\encoder.py", line 180, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type ApiModel is not JSON serializable

This error occurs because the kaggle_api_extended.py helper method in kaggle_api_extended.py attempts to pass raw generated models (such as ApiModel and ApiModelInstance) directly to json.dumps().

kaggle-cli/src/kaggle/api/kaggle_api_extended.py

Lines 5898 to 5900 in 4fc2429

	def print_obj(self, obj, indent=2):
	pretty = json.dumps(obj, indent=indent)
	print(pretty)

Solution

Updated the kaggle_api_extended.py helper method to call .to_dict() on the object before serialization:

def print_obj(self, obj, indent=2):
    pretty = json.dumps(obj.to_dict(), indent=indent)
    print(pretty)

Affected Commands

This resolves crashes in the following CLI commands (when running without the -p/--path option):

• kaggle models get <model> (via kaggle_api_extended.py)
• kaggle models instances get <model_instance> (via kaggle_api_extended.py)

Both ApiModel and ApiModelInstance implement .to_dict(), allowing the standard json.dumps library to successfully serialize the resulting dict format.

[stevemessick]

/gcbrun

[stevemessick]

Thanks!