Unable to access nested list property using dot(.) notation as specified in documentation.

[mukeshsharma1201]

Code

field = fields.Raw(attribute='bar.0')
assert field.output('foo', {'bar': [42]}) == 42

Repro Steps (if applicable)
Try with the above snippet

Expected Behavior
Properties which are nested under list should be accessible according to https://flask-restplus.readthedocs.io/en/stable/marshalling.html#renaming-attributes
AND
https://flask-restx.readthedocs.io/en/latest/marshalling.html#renaming-attributes

Actual Behavior
A description of the unexpected, buggy behaviour.

Error Messages/Stack Trace
No error/exception thrown, but it outputs None

Environment
Python 3.7.2
Flask 1.1.1
Werkzeug 0.16.1
Flask-RESTPlus 0.13.0
flask-restx 0.1.1

Additional Context

This is the exact issue #783 of flask-restplus. Since I am experiencing the same behaviour in flask-restx and there are no previous issues mentioning this, so I am creating an exact copy of the issue here!

There is an open PR on flask-restplus that solves the issue. I am just beginner with python and flask-restx, but if anyone can port that solution here, it would be great!

[arajkumar]

Hey, I can port the change to this active project. Thanks !

[mukeshsharma1201]

That's awesome @arajkumar!
Thank you so much, Hope this gets merged soon! 😄

[mukeshsharma1201]

Till this gets fixed I am using functions as a workaround

def getItem(x):
  return x[0]

field = fields.Raw(attribute=getItem)

[j5awry]

I've confirmed the bug, and looking at the PR now.