Pattern-matching callbacks not triggered, producing TypeErrors 'unexpected keyword argument'

[notgonnamakeit]

Running a Dash app that uses pattern-matching callbacks by itself works fine but as soon as DjangoDash is being imported, the following error shows up even if the app is run standalone outside of Django:

TypeError: callback_test() got an unexpected keyword argument 'background_callback_manager'

I can work around the issue by adding all keyword arguments it's complaining about and run the Dash app on its own with working callbacks but as soon as I run it within Django, the callbacks won't work:

def callback_test(n_clicks, background_callback_manager=None, callback_context=None, app=None, app_on_error=None, app_use_async=None):

dash==3.2.0 dash-bootstrap-components==2.0.3 dash-core-components==2.0.0 dash-extensions==2.0.4 dash-html-components==2.0.0 dash-table==5.0.0 dash-tvlwc==0.1.1 django-plotly-dash==2.5.0

[delsim]

@notgonnamakeit do you have a simple example app/script that exhibits this issue? Doesnt have to do anything interesting except generate the error when importing DjangoDash as you describe.

[notgonnamakeit]

Sorry for the late reply, got swamped with different things. Here's a simple example, I think it's from the plotly website. The import of DjangoDash creates the behaviour even though it's not used. Same behaviour in a Django app.

# TypeError: display_dropdowns() got an unexpected keyword argument 'background_callback_manager'
# If you remove the following import, the app works fine

from django_plotly_dash import DjangoDash

# everything from here works

from dash import Dash, dcc, html, Input, Output, ALL, Patch, callback

app = Dash()

app.layout = html.Div(
    [
        html.Button("Add Filter", id="add-filter-btn", n_clicks=0),
        html.Div(id="dropdown-container-div", children=[]),
        html.Div(id="dropdown-container-output-div"),
    ]
)

@callback(
    Output("dropdown-container-div", "children"), Input("add-filter-btn", "n_clicks")
)
def display_dropdowns(n_clicks):
    patched_children = Patch()
    new_dropdown = dcc.Dropdown(
        ["NYC", "MTL", "LA", "TOKYO"],
        id={"type": "city-filter-dropdown", "index": n_clicks},
    )
    patched_children.append(new_dropdown)
    return patched_children


@callback(
    Output("dropdown-container-output-div", "children"),
    Input({"type": "city-filter-dropdown", "index": ALL}, "value"),
)
def display_output(values):
    return html.Div(
        [html.Div(f"Dropdown {i + 1} = {value}") for (i, value) in enumerate(values)]
    )


if __name__ == "__main__":
    app.run(debug=True)