Map distance app error when switching maps #27
Description
Thanks for the awesome templates!
I'm finding that the map-distance app is erroring when switching maps on a local deployment (the gallery app is fine)
Python version 3.12 and 3.11 tried.
Environment tested
python 3.11.11
❯ pip freeze
anyio==4.8.0
appdirs==1.4.4
asgiref==3.8.1
asttokens==3.0.0
branca==0.8.1
certifi==2024.12.14
charset-normalizer==3.4.1
click==8.1.8
comm==0.2.2
decorator==5.1.1
executing==2.1.0
faicons==0.2.2
geographiclib==2.0
geopy==2.4.1
h11==0.14.0
htmltools==0.6.0
idna==3.10
ipyleaflet==0.19.2
ipython==8.31.0
ipywidgets==8.1.5
jedi==0.19.2
Jinja2==3.1.5
jupyter-leaflet==0.19.2
jupyter_core==5.7.2
jupyterlab_widgets==3.0.13
linkify-it-py==2.0.3
markdown-it-py==3.0.0
MarkupSafe==3.0.2
matplotlib-inline==0.1.7
mdit-py-plugins==0.4.2
mdurl==0.1.2
narwhals==1.21.1
orjson==3.10.14
packaging==24.2
parso==0.8.4
pexpect==4.9.0
platformdirs==4.3.6
prompt_toolkit==3.0.48
ptyprocess==0.7.0
pure_eval==0.2.3
Pygments==2.19.1
python-dateutil==2.9.0.post0
python-multipart==0.0.20
questionary==2.1.0
requests==2.32.3
shiny==1.2.1
shinywidgets==0.4.2
six==1.17.0
sniffio==1.3.1
stack-data==0.6.3
starlette==0.45.2
traitlets==5.14.3
traittypes==0.2.1
typing_extensions==4.12.2
uc-micro-py==1.0.3
urllib3==2.3.0
uvicorn==0.34.0
watchfiles==1.0.3
wcwidth==0.2.13
websockets==14.1
widgetsnbextension==4.0.13
xyzservices==2024.9.0
The following error is raised when choosing a different map from the dropdown, e.g. starting with WorldImagery and selecting Mapnik:
Traceback (most recent call last):
File ".../lib/python3.11/site-packages/shiny/reactive/_reactives.py", line 584, in _run
await self._fn()
File ".../lib/python3.11/site-packages/shiny/_utils.py", line 279, in fn_async
return fn(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^
File "./map-distance/app.py", line 165, in _
update_basemap(map.widget, input.basemap())
File "./map-distance/app.py", line 185, in update_basemap
map.remove(layer)
File ".../lib/python3.11/site-packages/ipyleaflet/leaflet.py", line 3168, in remove
if item.model_id not in self._layer_ids:
^^^^^^^^^^^^^
File ".../lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 552, in model_id
return self.comm.comm_id
^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'comm_id'
.../lib/python3.11/site-packages/shiny/reactive/_reactives.py:566: ReactiveWarning: Error in Effect: 'NoneType' object has no attribute 'comm_id'
await self._run()
Unhandled error: 'NoneType' object has no attribute 'comm_id'
The app then freezes:
Also note that when a different map is selected and the page is refreshed, the new map loads correctly, e.g. Mapnik in this example:
