[BUG] Exception when property of patched_fig is viewed

[luggie]

I know that it is currently not supported to view properties of patch_fig=Patch() but when e.g. iterating over trace names like so:

 for trace in patched_fig['data']:
        print(trace['name'])

no exception or error message is thrown but an endless stream of

...
<dash._patch.Patch object at 0x7f3b89a89b80>
<dash._patch.Patch object at 0x7f3b8305c0a0>
<dash._patch.Patch object at 0x7f3b89a89b80>
<dash._patch.Patch object at 0x7f3b8305c0a0>
<dash._patch.Patch object at 0x7f3b89a89b80>
<dash._patch.Patch object at 0x7f3b8305c0a0>
...

This is not exactly intended right?

I got there by trying to delete a trace of patched_fig by its name which otherwise appears not be possible (or is it?)

[alexcjohnson]

Right, you can’t read from the prop this way, only write. We do have an open issue somewhere to support the kind of query-targeted updates you’re suggesting but it hasn’t been worked on yet.

I suppose we could override __repr__ for Patch objects to describe that you can’t read from them, would that help?

[T4rk1n]

This create an infinite loop, should implement __iter__ to raise an error.

[luggie]

Right, you can’t read from the prop this way, only write. We do have an open issue somewhere to support the kind of query-targeted updates you’re suggesting but it hasn’t been worked on yet.

I suppose we could override __repr__ for Patch objects to describe that you can’t read from them, would that help?

Yes that would help.
Which open issue do you mean? :)