I try to do a simple model with the Model Designer of QGIS and I have an issue with the algorithms Select by expression
.
And when I want to check the validity of the model the explanation is just : The Algorithm is not available
You can see the settings I used for Select by expression
Does someone know why I can't use Select by expression ?
Moreover, you can see my QGIS settings with the following screenshot
OK, as Babel said I tried to use Extract selected features
and it works but only if I set a model output also for this algorithm
When I set algorithm output it doesn't work
Best Answer
You have not set any valid input for
Modify current selection by
, it is empty. If you want to create a new selection, set the icon to the left toValue
(icon123
instead of the gear icon) and choose an option, e.g.creating new selection
.Use an
Extract selected Features
algorithm after theSelect by expression
algorithm, then use this as input forClip
algorithm.