I'm generating a pydantic_v2.BaseModel from the envoy config jsonschema found here:

https://github.com/jcchavezs/envoy-config-schema/releases/tag/v1.21.0

For some of these schema files, if I pass a directory for output it produces this error:

$ pip install datamodel-code-generator[http]
$ mkdir schema_models/
$ datamodel-codegen --input-file-type jsonschema --output-model-type pydantic_v2.BaseModel --output schema_models/ --url https://github.com/jcchavezs/envoy-config-schema/releases/download/v1.21.0/v2_Runtime.json
Traceback (most recent call last):
  File "xxx/datamodel_code_generator/__main__.py", line 447, in main
    generate(
  File "xxx/site-packages/datamodel_code_generator/__init__.py", line 513, in generate
    file = path.open('wt', encoding=encoding)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/adamh/.pyenv/versions/3.11.5/lib/python3.11/pathlib.py", line 1044, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
IsADirectoryError: [Errno 21] Is a directory: 'xxx/schema_models'

But if I try to always output to a file it fails in a different way on another file:

$ datamodel-codegen --input-file-type jsonschema --output-model-type pydantic_v2.BaseModel --output v2_LayeredRuntime.py --url https://github.com/jcchavezs/envoy-config-schema/releases/download/v1.21.0/v2_LayeredRuntime.json
xxx/datamodel_code_generator/parser/jsonschema.py:338: UserWarning: format of 'regex' not understood for 'string' - using default
  warn(f'format of {format__!r} not understood for {type_!r} - using default' '')
Modular references require an output directory, not a file

If I comment out this line it does seem to work for all input files with output going to one directory:

https://github.com/koxudaxi/datamodel-code-generator/blob/main/datamodel_code_generator/parser/base.py#L1436

But I'm not sure what the impact of that is, the line is quite old.