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[BUG] KeyError output_spec = kwargs.pop("outputs_list") #1236

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drahnreb opened this issue May 6, 2020 · 4 comments
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[BUG] KeyError output_spec = kwargs.pop("outputs_list") #1236

drahnreb opened this issue May 6, 2020 · 4 comments

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@drahnreb
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drahnreb commented May 6, 2020 •
edited
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Environment
pip list | grep dash

dash                      1.11.0 
dash-bootstrap-components 0.9.2  
dash-core-components      1.9.1  
dash-html-components      1.0.3  
dash-renderer             1.4.0  
dash-table                4.6.2

Bug
Hidden group fails on callback Input. Eg. dbc.ListGroup
Returning KeyError in callback function.
Minimal working example to reproduce:

import dash_bootstrap_components as dbc
app.layout = dbc.Col([
		dbc.ListGroup(
		    [
		        dbc.ListGroupItem("Active item", active=True),
		    ],
		    id="ListGroup", style={"visibility": "hidden"}
		),
		dbc.Button("Create", n_clicks=0, id="Button")
	])

@app.callback(
     Output('ListGroup', 'children'),
    [Input('Button', 'n_clicks')],
    [State('ListGroup', 'children')]
)
def changeItems(click, listofItems):
	if click:
		listofItems.append(
        	dbc.ListGroupItem(f"Item {click}")
        )
	return listofItems

Expected behavior
Specifying the following does not throw error:

style={"visibility": "visible"}
@bluedaze
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It would be extremely helpful is this error gave you more context, or information. I've been fighting with this for a couple of days now.

@will-browneCF
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Had the same error from calling a function called 'save_settings' within a callback function.
Couldn't for the life of me figure it out. Bug fixed by renaming the function. Bizarre

@drahnreb
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Author

Yes, the issue appears to be related to function names. Changing my decorated function is solving this.
Might indicate a duplicate function, that is tried to wrapped at multiple places.

Hard to troubleshoot with the Error message alone. But anyone who stumbles over it, please search for the function.

@snyk-bot snyk-bot mentioned this issue May 9, 2021
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This was referenced Sep 15, 2021
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@maxwellmadewell
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I just had a similar issue - My callback function had the same name as another downstream chained function. Renaming the callback function solved this issue for me.

@baby636 baby636 mentioned this issue Nov 5, 2022
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@snyk-bot snyk-bot mentioned this issue Nov 5, 2022
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@baby636 baby636 mentioned this issue Nov 5, 2022
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@baby636 baby636 mentioned this issue Dec 25, 2022
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@snyk-bot snyk-bot mentioned this issue Dec 26, 2022
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@baby636 baby636 mentioned this issue Dec 26, 2022
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This was referenced Jun 21, 2023
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This was referenced Nov 27, 2023
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This was referenced Dec 20, 2023
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This was referenced May 13, 2024
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4 participants
@drahnreb @bluedaze @will-browneCF @maxwellmadewell