Webargs not respecting preload hooks

[multimeric]

I'm attempting to use marshmallow-jsonapi with webargs. Now one of the key features of the jsonapi schemas is the pre-load hook that unwraps the data from {data: {...}} into {...}. However, it seems that webargs never runs the pre-load hooks. For this reason, converting my code from:

def post(self):
    data = SomeJsonApiSchema().load(request.json)    
    # Use data somehow

to

@use_args(SomeJsonApiSchema(), locations=('json',))
def post(self):
    # Use data somehow

does not work! It raises the error:

{'_schema': [{'detail': 'Object must include `data` key.', 'source': {'pointer': '/'}}]}

Now, it seems like we could easily run pre_dump hooks, if we loaded the entire input object in one go. However, we seem to re-parse the input data each time we need to parse a field, hence the need for the self._cache["json"] etc. Is there any reason for this? Why can't we get the entire input object as a dictionary, either from the query string, body, json etc?

[lafrech]

Hopefully, this should be fixed by @sirosen's heroic refactor in #420.

[multimeric]

Wow, it does indeed look heroic. I'll wait and see!

[lafrech]

@TMiguelT would you like to check if this is fixed in webargs 6 beta ?

[lafrech]

Closing as this should be fixed in 6.0.0 beta. Please reopen if it is not.