Parser code uses old openapi2 "definitions" instead of "components/schemas"

I am debugging this package, which explodes parsing a remote reference openapi.

Traceback (most recent call last):
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/__main__.py", line 574, in main
    generate(
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/__init__.py", line 371, in generate
    results = parser.parse()
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/base.py", line 460, in parse
    self.parse_raw()
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/openapi.py", line 397, in parse_raw
    self.parse_raw_obj(
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1180, in parse_raw_obj
    self.parse_obj(name, JsonSchemaObject.parse_obj(raw), path)
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1200, in parse_obj
    self.parse_ref(obj, path)
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1141, in parse_ref
    self.parse_ref(property_value, path)
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1120, in parse_ref
    self.resolve_ref(obj.ref)
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1109, in resolve_ref
    self._parse_file(
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1324, in _parse_file
    models = get_model_by_path(raw, object_paths)
  File "/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 54, in get_model_by_path
    return get_model_by_path(schema[keys[0]], keys[1:])
KeyError: ''

I am sure I am on the latest version:

/Users/tommy/.pyenv/versions/3.10.6/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/datamodel_code_generator/parser/jsonschema.py", line 54, in get_model_by_path

When I open this file, I see lots of mentions of #/definitions, but thats openapi2 lingo as noted at the bottom of the page here: https://swagger.io/docs/specification/components/

OpenAPI 2.0                    OpenAPI 3.0
'#/definitions/User'         → '#/components/schemas/User'

However, there are 0 usages of #/Components

Does this package support OpenAPI3, or am I invoking it wrong? I used:

datamodel-codegen --input-file-type openapi --input dataapi/openapi.yaml --output model.py

DEBUGGING:

The remote reference file we are trying to parse is actually public, here: http://merq-api-assets.s3-website-us-east-1.amazonaws.com/swagger_components.yaml

the paths is showing up as:

['', 'merq-api-assets.s3-website-us-east-1.amazonaws.com', 'swagger_components.yaml#', 'components', 'schemas', 'AirflowConfig']

However, 'swagger_components.yaml#', 'components', does not look right

[koxudaxi]

The code generator doesn’t support OpenAPI 2(a.k.a Swagger). we should update parser/openapi.py for OpenAPI. I will request to review it with you after I create the PR.

[koxudaxi]

@tommyjcarpenter I have released the new version as 0.13.5 🎉