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nick4rivers/pyqgis-duplicate-layer.py

Last active October 21, 2021 16:53
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PyQGIS duplicate a layer, set a filter, and set a layer variable
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pyqgis-duplicate-layer.py
# how to duplicate or clone a map layer
# renaming the map layer and setting a filter
# and also setting a variable on a layer for use in scripts
# also shows how to connnect a .qml to a map layer
# Select a layer that is already added to the interface
layer_original = QgsProject.instance().mapLayersByName('original')[0]
# duplicate or clone the layer
layer_cloned = layer_original.clone()
# add it to the map
QgsProject.instance().addMapLayer(layer_cloned)
# set a name for the duplicate layer
layer_cloned.setName('layer_cloned')
# set a layer filter, in this case to just a parent table id
layer_cloned.setSubsetString("parent_id = 42")
# load a custom .qml for styling, forms, etc....
layer_cloned.loadNamedStyle('my_path/layer_style.qml')
# set a variable that would become the parent id, could be used as default value when creating a new record
QgsExpressionContextUtils.setLayerVariable(layer_cloned,'parent_id', 42)
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