Describe the bug
If file A refers to file B via url, and file B refers to file C using a relative path, datamodel-codegen searches local file system (from A) for file C instead of adding the relative path to the url of file B.

To Reproduce

I cloned
https://github.com/ga4gh-beacon/beacon-v2/tree/main
and tried converting the json schema file (file A in the description above)
https://github.com/ga4gh-beacon/beacon-v2/blob/main/models/json/beacon-v2-default-model/analyses/defaultSchema.json
to pydantic.

this file refers to file B using url like this:

"$ref": "https://raw.githubusercontent.com/ga4gh-beacon/beacon-v2/main/framework/json/common/beaconCommonComponents.json#/definitions/Info"

File B refers to file C using relative path like this:

"$ref": "./ontologyTerm.json",

File C is available at
https://raw.githubusercontent.com/ga4gh-beacon/beacon-v2/main/framework/json/common/ontologyTerm.json

but instead of finding this (by adding it to the url of file B), I get error

FileNotFoundError: [Errno 2] No such file or directory: '/Users/sondre/beacon-v2-main/models/json/beacon-v2-default-model/analyses/ontologyTerm.json'

i.e. the relative path is added to the path of file A.

Used commandline:

$ datamodel-codegen --input defaultSchema.json

Expected behavior
I think it should add the relative path to the file containing the relative path

Version:

• Python version: 3.10.0
• datamodel-code-generator version: 0.25.8

Additional context
I forked and made a workaround, but i figured i should still let you know