pyqgisqgisqgis-modeler
Would it be possible to run a script in a QGIS model so that it only runs on selected features from an input layer? I don't want to use the option in the toolbox options as I have other models that require to run without selections.
I just a model to only run on selected features in the input layer and return an error if no feature is selected. I'm thinking a script added immediately after the input in the model?
You can create and run various actions from the Attribute Table for each feature. If you go to Layer Properties > Actions and add a new action, there is an option which allows you to run the action from the attribute table:
Once you have created an action, you can choose to show it as a combo box:
Now when you open your attribute table, you can see a new field containing the actions:
If you want your action to be run on multiple selected features, you will need to include this into your action (if possible). In my example, I am using Python to print the values from the first field for all selected features. So if I select multiple features and then click on any action combo box, it will print the values of the selected features:
However, there seems to be a Run layer action when you right-click an attribute but unfortunately, I can't seem to find much information concerning this. I have posted this as a new question as I am also curious:
For only use selected feature use QgsProcessingFeatureSourceDefinition
https://qgis.org/api/classQgsProcessingFeatureSourceDefinition.html
your code,but the input is only selected features
import processing
input_vlayer = 'Some path'
intersect_vlayer = 'Some path'
input_vlayer = iface.addVectorLayer(input_vlayer, 'input_vlayer', 'ogr')
intersect_vlayer = iface.addVectorLayer(intersect_vlayer,
'intersect_vlayer', 'ogr')
for i in range(5):
# Select the features
intersect_vlayer.select(i)
# Set input params
params = {'INPUT':input_vlayer,
'PREDICATE':0,
'INTERSECT':QgsProcessingFeatureSourceDefinition(intersect_vlayer.id(), True), # USE HERE THE SELECTED FEATURES
'METHOD':0}
result = processing.run("qgis:selectbylocation", params)
# Remove the current selection and then pass to the next one
intersect_vlayer.removeSelection()
Best Answer
Adding Save selected features should do the trick: