Pattern Maching ID not working in Dash callback `cancel`
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- Lenguaje dominante
- Python
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Descripción
Environment:
dash 2.17.1
dash_ag_grid 31.2.0
dash-bootstrap-components 1.6.0
dash-core-components 2.0.0
dash-html-components 2.0.0
dash-table 5.0.0
Describe the bug
When defining the cancel behaviour of a Dash bootstrap component button within the callback signature I am greeted with the error
dash.exceptions.WildcardInLongCallback: long callbacks does not support dependencies with
pattern-matching ids
Received: <Input `{"index":["MATCH"],"type":"cancel-button"}.n_clicks`>
Using pattern matching IDs in the running kwarg for the callback signature works perfectly fine but the cancel kwarg does not.
Expected behavior
I expected the cancel behaviour to work as with buttons without pattern matching IDs after coming across what I thought were the fixes here.
Example
from dash import Dash, html, callback, Output, Input, DiskcacheManager, MATCH
import dash_bootstrap_components as dbc
import diskcache, time
cache = diskcache.Cache("./cache")
background_callback_manager = DiskcacheManager(cache)
app = Dash(__name__, background_callback_manager=background_callback_manager)
app.layout = html.Div(
[
html.Div([html.P(id={"type": "paragraph_id", "index": 1}, children=["Button 1 not clicked"])]),
dbc.Button(id={"type": "button_id", "index": 1}, children="Run Job 1!"),
dbc.Button(id={"type": "button_id", "index": 2}, children="Run Job 2!"),
dbc.Button(id={"type": "cancel_button_id", "index": 1}, children="Cancel Running Job 1!"),
dbc.Button(id={"type": "cancel_button_id", "index": 2}, children="Cancel Running Job 2!"),
html.Div([html.P(id={"type": "paragraph_id", "index": 2}, children=["Button 2 not clicked"])]),
]
)
@callback(
output=Output({"type": "paragraph_id", "index": MATCH}, "children"),
inputs=Input({"type": "button_id", "index": MATCH}, "n_clicks"),
running=[
(Output({"type": "button_id", "index": MATCH}, "disabled"), True, False),
(Output({"type": "cancel_button_id", "index": MATCH}, "disabled"), False, True),
],
cancel=[Input({"type": "cancel_button_id", "index": MATCH}, "n_clicks")],
background=True,
prevent_initial_call=True
)
def callback(n_clicks):
time.sleep(2.0)
return [f"Clicked {n_clicks} times"]
if __name__ == "__main__":
app.run(debug=True)
returns the following error:
dash.exceptions.WildcardInLongCallback: long callbacks does not support dependencies with
pattern-matching ids
Received: <Input `{"index":["MATCH"],"type":"cancel_button_id"}.n_clicks`>
However if I comment out the cancel kwarg, the dashboard runs, the cancel buttons just don't function how I want them to.
Guía de contribución
Primeros pasos
- Lee el issue completo y luego la guía de contribución del proyecto.
- Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
- Haz un fork del repositorio y trabaja en una rama.
- Abre un pull request que haga referencia al número del issue.
Línea de trabajo
Ejecuta la aplicación Dash mínima proporcionada con las versiones de paquete indicadas y confirma que el Input de cancelación de pattern matching genera WildcardInLongCallback mientras las dependencias utilizadas funcionan. Se considera terminado cuando el ejemplo se inicia correctamente con la dependencia de cancelación MATCH y los botones de cancelación funcionan sin la excepción indicada.
Escrito por el modelo de indexación a partir del texto del issue.
Evaluación
- Stack tecnológico
- python
- Área
- backend
- Tipo de issue
- Error
- Dificultad
- 3/5
- Tiempo estimado
- 1-2 días
- Estado de actividad
- Estancado
- Claridad
- Bien especificado
- Aptitud para principiantes
- 45/100