I'm building a plugin in QGIS, one of its part is processing algorithm: intersection. I want to save the result as memory layer, and then work on it. Following code was working fine, nothing changed (I changed nothing), and: boom! it stopped working. The problem is in the 2nd line:
processing.runandload("qgis:intersection",selectedLayer,selectedLayer_2, "memory:temp_layer")
layer = QgsMapLayerRegistry.instance().mapLayersByName("memory:temp_layer")[0]
The memory layer is created (I can see it in QGIS) but I can't define 'layer'. I'm getting an error:
IndexError: list index out of range.
Why? :(
Answer
I suspect this is probably dependent on the Processing plugin version for each of those computers. Your following line checks the list of loaded layers and will only define layer if a layer has the name memory:temp_layer.
layer = QgsMapLayerRegistry.instance().mapLayersByName("memory:temp_layer")[0]
In the older versions of the Processing plugin, you can define the name of the memory layer "memory:any_name". The line above will work.
In the latest versions, the default name of the tool is used instead (e.g. "Intersection"). The line above will not work.
I would suggest checking the Processing plugin for each of your computers and updating it to the latest version (currently at 2.12.2) from the toolbar:
Plugins > Manage and Install Plugins...
And use the following line instead:
layer = QgsMapLayerRegistry.instance().mapLayersByName("Intersection")[0]
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