QML Settings doesn't have "remove" function !

Mohammadsm

Hi
I have some settings in my app, which it's parameters are stored in a file, using Setting API. I can save and load parameters, but need to remove them, sometimes; Like QSettings::remove() in C++.
But it seems there is no such function in QML API of Settings.

How it is possible?

raven-worx

@Mohammadsm
i havent tried yet, but i guess in QML you only have two values to assign which might unset the value. undefined and null
worth a try at least
on the other hand i dont think its possible to remove the whole property from the object itself, after creation

Mohammadsm

It's not about property, I mean removing a key from a Settings object:
https://doc.qt.io/qt-5/qsettings.html#remove
But doing this in QML.

Settings in QtQuick, doesn't have remove method :(
https://doc.qt.io/qt-5/qml-qt-labs-settings-settings.html#methods

I need to remove a key from Settings object.

Thank you for responding

raven-worx

@Mohammadsm said in QML Settings doesn't have "remove" function !:

It's not about property, I mean removing a key from a Settings object:

iitt is, since in the QML Settings type the keys are taken from the properties

Mohammadsm

It didn't worked :(
I tried:

setting.setValue("step_1", null)

but the app.conf shows:
[General]
step_1=@Variant(\0\0\0\x94)

and

setting.setValue("step_1", undefined)

makes:
[General]
step_1=@Invalid()

They don't remove 'step_1' from app.conf file!

Munkhtamir

Which variable do you want to remove from your settings?

Entire Group or child key or file which contains some config?

J.Hilk

@Mohammadsm
QSettings is technically still part of the labs import and not really considered production ready (may change become incompatible at any moment)

So, this seems like a perfect opportunity to make a feature request at https://bugreports.qt.io/secure/Dashboard.jspa

meanwhile,
I suggest subclassing QSettings, and making the remove function Q_INVOKABLE and exposing that new class for your use in QML

Mohammadsm

@Munkhtamir
I want to remove "step_1" which is a key in my Settings object:

Settings{
    id: stg
}
.
.
.
stg.setValue("step_1", 127)

Mohammadsm

@J-Hilk
I managed the required behavior, somehow.

By blanking the key value:

stg.setValue("step_1", "")

then scanning the keys, which have non-empty value, and skipping the empty ones.

I'll file a bug, cause I think it's a needed method!
By the way, thank you all