[Bug]: 0.23.0 regression: `default: []` leads to ValidationError: "SchemaPath('…#default') is not of type 'array'"

[andersk]

Actual Behavior

A simple array parameter with a default value like this:

name: foo
in: query
schema:
 type: array
 default: []

leads to an error in 0.23.0:

Traceback (most recent call last):
 File "/home/anders/python/openapi-core/openapi_core/validation/decorators.py", line 31, in wrapper
 return f(*args, **kwds)
 File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 208, in _get_parameter
 value, _ = self._get_param_or_header_and_schema(param, location)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/validation/validators.py", line 196, in _get_param_or_header_and_schema
 self._validate_schema(schema, casted)
 ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/validation/validators.py", line 174, in _validate_schema
 validator.validate(value)
 ~~~~~~~~~~~~~~~~~~^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/validation/schemas/validators.py", line 40, in validate
 raise InvalidSchemaValue(value, schema_type, schema_errors=errors)
openapi_core.validation.schemas.exceptions.InvalidSchemaValue: Value paths#/test#get#parameters#0#schema#default not valid for schema of type array: (<ValidationError: "SchemaPath('paths#/test#get#parameters#0#schema#default') is not of type 'array'">,)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
 File "/home/anders/python/openapi-core/default_test.py", line 25, in <module>
 spec.validate_request(request)
 ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/app.py", line 564, in validate_request
 self.validate_apicall_request(request)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/app.py", line 613, in validate_apicall_request
 self.request_validator.validate(request)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 287, in validate
 raise err
 File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 172, in _get_parameters
 value = self._get_parameter(parameters, param)
 File "/home/anders/python/openapi-core/openapi_core/validation/decorators.py", line 33, in wrapper
 self._raise_error(exc, self.err_validate_cls, f, *args, **kwds)
 ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/anders/python/openapi-core/openapi_core/validation/decorators.py", line 58, in _raise_error
 raise init(**kw) from exc
openapi_core.validation.request.exceptions.InvalidParameter: Invalid query parameter: foo

Expected Behavior

No errors; this worked in 0.22.0.

Steps to Reproduce

from openapi_core import OpenAPI
from openapi_core.testing import MockRequest

spec = OpenAPI.from_dict(
 {
 "openapi": "3.1.0",
 "info": {"version": "0", "title": "Test"},
 "paths": {
 "/test": {
 "get": {
 "parameters": [
 {
 "name": "foo",
 "in": "query",
 "schema": {"type": "array", "default": []},
 }
 ],
 "responses": {"200": {"description": ""}},
 },
 }
 },
 }
)
request = MockRequest("http://localhost", "get", "/test")
spec.validate_request(request)

OpenAPI Core Version

0.23.0

OpenAPI Core Integration

MockRequest

Affected Area(s)

schema, validation

References

No response

Anything else we need to know?

• git bisect implicates commit 2e83cb9 “Upgrade jsonschema-path” (Upgrade jsonschema-path 0.4.0b8 and openapi-spec-validator 0.8.0b3 #1002).

Would you like to implement a fix?

None

[p1c2u]

@andersk thank you for the report. Te fix was merged.