When “Mark as cell(s)” in the plugin, there is an error: ‘Selection’ object is not subscriptable.

[adamltyson]

New bug with napari v0.4.8

https://forum.image.sc/t/cellfinder-napari-crashes-with-segmentation-fault-on-macos-when-saving-training-data-in-curation/52978/

[kailynkfields]

I am also seeing this error (without any crashing like the original post in the forum).
`TypeError Traceback (most recent call last)
/opt/anaconda3/envs/brainglobe/lib/python3.8/site-packages/cellfinder_napari/curation.py in mark_as_cell(self=<cellfinder_napari.curation.CurationWidget object>)
268
269 def mark_as_cell(self):
--> 270 self.mark_point_as_type("cell")
self.mark_point_as_type = <bound method CurationWidget.mark_point_as_type of <cellfinder_napari.curation.CurationWidget object at 0x7f3f546b7f70>>
271
272 def mark_as_non_cell(self):

/opt/anaconda3/envs/brainglobe/lib/python3.8/site-packages/cellfinder_napari/curation.py in mark_point_as_type(self=<cellfinder_napari.curation.CurationWidget object>, point_type='cell')
286
287 if len(self.viewer.layers.selected) == 1:
--> 288 layer = self.viewer.layers.selected[0]
layer = undefined
self.viewer.layers.selected = Selection({<Points layer 'Cells' at 0x7f3f54080ac0>})
289 if type(layer) == napari.layers.Points:
290

TypeError: 'Selection' object is not subscriptable
`

[adamltyson]

Can you try downgrading to napari version 0.4.7? This should fix it until I get time to look into this properly.

[kailynkfields]

Tentatively that seemed to work. Thank you!

[sofroniewn]

We've deprecated 'viewer.layers.selected', now 'viewer.layers.selection' should be used. It's now a set, so you might need to do list(viewer.layers.selection)[0] to recover the above behaviour. Sorry for that breaking change

[adamltyson]

Thanks @sofroniewn, this is fixed in df63b31.

@kailynkfields this will be in version 0.0.12 by the end of the day.