I wanted to duplicate a layer in qgis3 using python (display the same vector data as different layers) per this question (How can I duplicate a layer in QGIS?). In addition, I need to:
make sure that the added clone layer is at the bottom of the layers
check if the clone already exists and duplicate only if the clone doesn't exist among the current list of layers (to avoid multiple clones).
The code I have so far (for duplicating the first layer) is:
vl = iface.mapCanvas().layer(0) vl_clone = iface.addVectorLayer(vl.source(), vl.name() + "_clone", vl.providerType())
Currently the new layer is added to the top and becomes
layer(0). I tried to follow existing GIS.SE questions (e.g. How to move layers in the Layer Order Panel using PyQGIS?). But existing questions/answers are for QGIS 2, and involve breaking changes in QGIS3 (e.g.
Does anyone know how to extend the above code to work in QGIS3?
-- EDIT --
The current code I have so far from synthesizing existing answers/documentation is below. Still, the layer order doesn't change. I tried different values in
insert() such as
3, to no avail.
lyr1 = iface.mapCanvas().layer(0) lyr1_clone = iface.addVectorLayer(lyr1.source(), lyr1.name() + "_clone", lyr1.providerType()) bridge = iface.layerTreeCanvasBridge() treeRoot = QgsProject.instance().layerTreeRoot() treeRoot.setHasCustomLayerOrder(True) order = treeRoot.customLayerOrder() order.insert( -1 , order.pop() ) # lyr1_clone to the bottom # lyr1_clone to the bottom treeRoot.setCustomLayerOrder( order ) bridge.setCanvasLayers()