QGIS PyQGIS – Resolve AttributeError on ‘QgsVectorLayer’ PendingFields

attributeerrorpyqgisqgisvector

I have been using the following Python code on QGIS 3 (2.99) to look up fields, for several months

id = feature.attributes()[layer.pendingFields().lookupField('ID')]

And it gives me an error today:

AttributeError: 'QgsVectorLayer' object has no attribute 'pendingFields'

Is this another breaking change in the QGIS development version? And what's the correct way to write it now?

Best Answer

The answer seems to be yes, another change in QGIS 2.99.

I saw a question (not available) from @Andreas Neumann on the qgis-dev mailing list regarding the same question.

@Etienne Trimaille and @Alessandro Pasotti reveal that pendingFields() is removed and suggest that you instead should use fields().

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I suggest you to avoid the legendInterface and use instead Layer Tree classes directly.

You're getting that error because addGroup returns an index (integer), that you're storing in your group variable and then calling a method that integers don't support.

You can see how to add groups (and even subgroups) to QGIS Layer Tree here: How to add a layer group using pyQGIS?

Once you've added a group, you can add layers to it by calling addLayer():

myGroup.addLayer(myLayer)

Have a look at these related posts:

PyQGIS – Fix AttributeError When Getting Selected Layers in QGIS

With the iface object, it is possible to get the layerTreeView, which has a method selectedLayers():

iface.layerTreeView().selectedLayers()

More methods on QgsLayerTreeView in the docs: https://qgis.org/api/classQgsLayerTreeView.html

Best Answer

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