Unable to open Notebook without metadata

[martinRenou]

Description

I am getting the following:

    Traceback (most recent call last):
      File "/home/martinrenou/micromamba/envs/glue-lab/lib/python3.11/site-packages/tornado/websocket.py", line 944, in _accept_connection
        await open_result
      File "/home/martinrenou/micromamba/envs/glue-lab/lib/python3.11/site-packages/jupyter_collaboration/handlers.py", line 236, in open
        if self.room.document.source != model["content"]:
           ^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/martinrenou/micromamba/envs/glue-lab/lib/python3.11/site-packages/jupyter_ydoc/ybasedoc.py", line 60, in source
        return self.get()
               ^^^^^^^^^^
      File "/home/martinrenou/micromamba/envs/glue-lab/lib/python3.11/site-packages/jupyter_ydoc/ynotebook.py", line 213, in get
        metadata=meta["metadata"],
                 ~~~~^^^^^^^^^^^^
    KeyError: 'metadata'

Leading to not being able to open the Notebook (it's an empty area on Jupyterlab)

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[fcollonval]

We could certainly fix it. But such notebook is invalid:

https://github.com/jupyter/nbformat/blob/633a433d13436247c5994f571911c74a1ec507d4/nbformat/v4/nbformat.v4.5.schema.json#L6

[martinRenou]

It's unclear to me as to why I ended up with this invalid Notebook though

[hbcarlos]

Hi @martinRenou. What version of jupyter_ydoc are you using?

In theory, this was fixed in https://github.com/jupyter-server/jupyter_ydoc/pull/158

[martinRenou]

I'm using 1.0.2

[fcollonval]

Did you played with your local installation? The reported line number in the error is not consistent with the code.

Line 213 of ynotebook at v1.0.2 is:

https://github.com/jupyter-server/jupyter_ydoc/blob/39ddee8dde55d9a601ac98912800bce1075d6fca/jupyter_ydoc/ynotebook.py#L213

Metadata query is at line 223 in v1.0.2:

https://github.com/jupyter-server/jupyter_ydoc/blob/39ddee8dde55d9a601ac98912800bce1075d6fca/jupyter_ydoc/ynotebook.py#L223

Could you try forcing a re installation?

[martinRenou]

Indeed 🤔

code /home/martinrenou/micromamba/envs/glue-lab/lib/python3.11/site-packages/jupyter_ydoc/ynotebook.py

gives me

So I'd say the traceback is lying!

[fcollonval]

You may be trolled by inconsistent byte-code version. Do you get .pyc files for ynotebook.py. If so you could give a try of removing them.