[0.14.0 regression] param['schema']['type'] in ['array', 'object'] raises KeyError: 'type'

[andersk]

This succeeds in 0.13.8 and unexpectedly raises KeyError: 'type' in 0.14.0. I bisected the problem to commit 35f8e28 “Spec path”.

from openapi_core import create_spec
from openapi_core.testing import MockRequest
from openapi_core.validation.request.validators import RequestValidator

spec = create_spec(
    {
        "openapi": "3.0.0",
        "info": {"title": "test", "version": "0"},
        "paths": {
            "/messages": {
                "get": {
                    "parameters": [
                        {
                            "name": "anchor",
                            "in": "query",
                            "schema": {
                                "oneOf": [{"type": "string"}, {"type": "integer"}]
                            },
                        }
                    ],
                    "responses": {"200": {"description": "Success."}},
                }
            }
        },
    },
)
validator = RequestValidator(spec)
request = MockRequest(
    "http://localhost", "GET", "/messages", args={"anchor": "first_unread"}
)
result = validator.validate(request)
result.raise_for_errors()

Traceback (most recent call last):
  File "oneof_test.py", line 31, in <module>
    result = validator.validate(request)
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 48, in validate
    params, params_errors = self._get_parameters(
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 138, in _get_parameters
    raw_value = self._get_parameter_value(param, request)
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 226, in _get_parameter_value
    aslist = get_aslist(param)
  File "/home/anders/python/openapi-core/openapi_core/schema/parameters.py", line 4, in get_aslist
    param['schema']['type'] in ['array', 'object']
KeyError: 'type'