[Feature Request] Allow choose an HTTP status code to return when raise a validation error about sanic-ext

[ahopkins]

🤔 This is possible already in a few ways.

OPTION 1 - custom error handling

from sanic_ext.exceptions import ValidationError


@app.exception(ValidationError)
async def handle_validation_error(*_):
    return json({"custom": "error"}, status=418)

The obvious downside is that you need to create your own message as well. Maybe this is what you want. If not ...

OPTION 2 - override default status

Similar to the previous, we create a custom exception handler, but use the default response and just change the status.

@app.exception(ValidationError)
async def handle_validation_error(request: Request, exception):
    response = request.app.error_handler.default(request, exception)
    response.status = 418
    return response

OPTION 3 - override the exception status

We can make Option 2 even easier by just overriding the default status on the exception itself:

from sanic_ext.exceptions import ValidationError

ValidationError.status_code = 418

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I think Option 3 achieves the feature you are looking for and is the easiest to implement.