Removes YMap for attachements

[fcollonval]

This is similar to #50

To test the changes, make sure you remove the jupyter_ystore database.

[davidbrochart]

Just to clarify, is this to match what's in JupyterLab's master branch?

[fcollonval]

Yes

[fcollonval]

Otherwise for now if you open the examples/notebooks/OutputExamples.ipynb, it fails because the attachments is YMap not a JSON object.

[fcollonval]

The error is a infinite recursive call within JSONExt.deepCopy because the YMap reference its parent.

[davidbrochart]

Thanks.
BTW, why do we enforce the "attachments" field when we create a raw or markdown cell (with {} when there are no attachments) and remove it when we get a cell (if there are are no attachments)?

[fcollonval]

why do we enforce the "attachments" field when we create a raw or markdown cell (with {} when there are no attachments) and remove it when we get a cell (if there are are no attachments)?

No idea - but indeed it will be good to simply not set attachments in such case.

[davidbrochart]

This was done in #27. Maybe @hbcarlos knows?

[davidbrochart]

I made both create_ycell and get_cell symetrical in 8a8c738: we remove attachments if it's an empty dict.

[hbcarlos]

Thanks.
BTW, why do we enforce the "attachments" field when we create a raw or markdown cell (with {} when there are no attachments) and remove it when we get a cell (if there are are no attachments)?

Because we need to initialize that attribute even when it is empty.

Why are we deleting it before saving it? I don't recall. Probably the nbformat doesn't allow empty attachments.

[davidbrochart]

Because we need to initialize that attribute even when it is empty.

Why? The documentation says:
"The attachments dictionary is an optional field and can be undefined or empty if the cell does not have any attachments."

[davidbrochart]

Thanks!

[fcollonval]

@meeseeksdev please backport to 0.2.x

[davidbrochart]

@meeseeksdev please backport to 0.2.x

Oh, I didn't know we could do that here 😄

[fcollonval]

Actually I don't have the right to do it. But you should be able.

[davidbrochart]

@meeseeksdev please backport to 0.2.x

[fcollonval]

It seems the Meeseeksdev GitHub App is not installed on this repository 😢

You should be able to add it in the settings of the project.

[davidbrochart]

@meeseeksdev Hello

[lumberbot-app]

Helloooo @davidbrochart, I'm Mr. Meeseeks! Look at me!

[davidbrochart]

@meeseeksdev please backport to 0.2.x

[davidbrochart]

You should be able to add it in the settings of the project.

Seems to work now!