[Bug]: Error desc not specifying what went wrong

[itsMGA]

Actual Behavior

So i use:

from openapi_core import validate_request

To validate request data versus schema:

validate_request(request_data, self.spec)

Here's the snipped for request body:

 getRequest:
  type: object
  properties:
    type_of:
      type: string
    name:
      type: string

My request:
r = requests.post(url='host/something/v012/get', data={'type_of': 'user', 'name': 'test'})
The error message raised is:

E                   Request body validation error

Not sure what's wrong based on the error desc
Do you guys know a better way to see more exact error descriotion (what's wrong with the request data vs yaml?)

Openapi_core version 0.18.1

Expected Behavior

Exected to isolate or relate what was not ok from request data vs yaml schema

Steps to Reproduce

Not sure what is wrong with my request yet

OpenAPI Core Version

0.18.1

OpenAPI Core Integration

requests

Affected Area(s)

No response

References

No response

Anything else we need to know?

No response

Would you like to implement a fix?

None

[itsMGA]

So i pinpointed the problem, my request uses basic auth, i was encoding user/pass with base64 which caused the above problem, still the error is really not as expected

[p1c2u]

Hi @itsMGA

thanks for the report. Please provide working example with full traceback.

[grinspins]

I found you have to dig a little deeper into the exceptions to get the exact problem. OpenApiError has a __cause__ attribute that points to the InvalidSchemaValue that's raised by the validator. InvalidSchemaValue has a schema_errors attribute, which is a list of jsonschema ValidationErrors. They contain the exact error message via ValidationError.message and if it's a nested field, the .path to the bad field. Looks like path parameter names can be retrieved from OpenApiError.name instead.
Hope that helps someone.

[ladaflac]

I was able to get some more information about a failed validation for my cases by calling __cause__ like @grinspins suggested.
I didn't have in the path errors though, so my results were a bit different.

In one case I got a RequestBodyValidationError which returns a "Request body validation error" string.
Getting the __cause__ on the error object returned:

MediaTypeNotFound(mimetype='application/vnd.2e.api.v2+json', availableMimetypes=['application/vnd.2e.shp.web.v1+json'])

and inspecting it showed an AttributeError, as "'dict' object has no attribute 'exc.__cause__'.

In another case I got a CastError, and __cause__ returned:

Failed to cast value to object type: b'{...}'

(with entire json body)
so a nice error message could be retrieved with __cause__.value.

Anyway, these maneuvers just don't feel right. Validation result should be something more readable and easily accessible. If there is a better way, but I haven't found it yet.