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Callbacks are not correctly checking to make sure the same output (id/property pair) is used only once #279
Description
Even though the documentation claims that an output pair can only exist in one callback, and even though there seems to be code that attempts to make this check, this doesn't seem to actually hold true. For example, the following app defines the same callback 3 times with a slightly different return value, and it seems that the last one to be called is the one that sticks:
library(dash)
app <- dash_app()
app %>% set_layout(
dccInput("text", "test"),
div(id = "out")
)
app %>% add_callback(
outputs = output("out", "children"),
params = input("text", "value"),
function(data) data
)
app %>% add_callback(
outputs = output("out", "children"),
params = input("text", "value"),
function(data) paste(data, "2")
)
app %>% add_callback(
outputs = output("out", "children"),
params = input("text", "value"),
function(data) paste(data, "3")
)
app %>% run_app()
Activity
daattali commentedon Oct 27, 2021
@HammadTheOne is this fixed?
HammadTheOne commentedon Oct 27, 2021
Yes, this should be fixed through #280. If the same id/prop pair is entered, this will now throw an error.
daattali commentedon Oct 28, 2021
I just tested this and it still doesn't throw any message or error, are you sure it's fixed? Can you run it and confirm
HammadTheOne commentedon Oct 28, 2021
I see this when running it off the latest dev branch version.
daattali commentedon Oct 28, 2021
I may have not run dev, sorry. I'll confirm and close the issue