[Bug]: Response content schema path is unresolvable

[litteratum]

Actual Behavior

I have the following paths:

openapi: 3.1.0
info:
  title: My API
  description: My API
  version: 1.0.0

paths:
  /customer:
    post:
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: response.json

The "response.json" schema exists on the same level as the "api.yaml".

Then I use OpenAPI.from_file_path("apis/api.yaml"). And it fails with:

referencing.exceptions.Unresolvable: response.json

So for some reason, response schema resolution always fails...

Expected Behavior

I expect response schemas to be looked up relative to the API specification file. The same they are looked up for requests (and which works for me).

Steps to Reproduce

1. Create the following "api.yaml":

   
   openapi: 3.1.0
   info:
   title: My API
   description: My API
   version: 1.0.0

paths: /customer: post: responses: '200': description: OK content: application/json: schema: $ref: response.json

2. Create a "response.json" file with `{}` content.
3. Run the following code:

from openapi_core import OpenAPI

OpenAPI.from_file_path("api.yaml")

### OpenAPI Core Version

0.19.2

### OpenAPI Core Integration

flask

### Affected Area(s)

dependencies, schema

### References

_No response_

### Anything else we need to know?

_No response_

### Would you like to implement a fix?

None

[litteratum]

Update: referencing paths also does not work:

paths:
  /customer:
    $ref: customer.yaml

I see "ValueError: unknown url type: 'customer.yaml'" from the tracelog.

Should it work or do I miss something?

[p1c2u]

You are missing spec_base_uri configuration to make referencing to work. It needs to be explicitly defined (version 0.19.3 will fix the problem).

import os

from openapi_core import Config, OpenAPI

SPEC_PATH = os.path.join(os.path.dirname(__file__), "api.yaml")

config = Config(spec_base_uri=f"file://{SPEC_PATH}")

OpenAPI.from_file_path(SPEC_PATH, config=config)

[litteratum]

@p1c2u, thank you for your support. It indeed solved my issue!