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I have made a custom form with a QgsRelationEditorWidget and with a QToolButton. I want to select a feature in this QgsRelationEditorWidget and press the button to open another form with this selected feature. For it, I need to get this selected feature attributes. The code is a py file.

I think I have to access to the QgsRelationEditorWidget with this code:

childFormWidget = dialog.findChildren(QgsRelationEditorWidget)[0]
childForm = childFormWidget.findChildren(QgsRelationEditorWidget)[0]
featureManager = childForm.featureSelectionManager()
infraManager.selectionChanged.connect(partial(changeSelection, featureManager))

But I have this error:

IndexError: list index out of range.

Also, I don't know how to access the attributes with featureManager.

How can I do it? How can I reach to the selected feature?

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In case someone needs it, finally I understood how does QgsIFeatureSelectionManager work. This code takes the selected features ids from a QgsRelationEditorWidget and passes it to the function "changeSelection" when we change the selection in widget.

childFormWidget = dialog.findChildren(QgsRelationEditorWidget)[0]
featureManager = childFormWidget.featureSelectionManager()
featureManager.selectionChanged.connect(changeSelection)

Then we define the changeSelection function. Here we access to the selected features by:

def changeSelection(deselected, selected):
    feat=selected               
    idact= feat[0]

Now with the feature's id, we can do all we need. In this case, I only select one feature en QgsRelationEditorWidget (feat[0])

0

After changing the code as follow:

childFormWidget = dialog.findChildren(QgsRelationEditorWidget)[0]
featureManager = childFormWidget.featureSelectionManager()
feat=featureManager.selectedFeatureCount ()     

I get the correct value of feat, in this case, 1. But I still can not get the attributes of the selected feature.

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