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I am trying to set the edit type of a vector layer to use a value relation. The Python commands below are processed without errors or warnings, but the when I check the properties in QGIS, only the EditType is set, but the data settings are empty. I use:

vlayer.setEditType(12, QgsVectorLayer.ValueRelation)
vlayer.ValueRelationData( 'releatedtable20131027113855772', 'key', 'value',False, True)

I got the name of the related table by inspecting:

ml=QgsMapLayerRegistry.instance().mapLayers()
dict(ml)

My guess is that I use the wrong string for referencing the layername. I have two questions: How to get the layername string to be used in ValueRelationData? Should I add further code to get it all working?

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The correct approach is to directly modify the ValueRelationData object you get from vlayer.valueRelation( idx )

vlayer.setEditType(12, QgsVectorLayer.ValueRelation)
vlayer.valueRelation(12).mLayer = 'releatedtable20131027113855772'
vlayer.valueRelation(12).mKey = 'key'
vlayer.valueRelation(12).mValue = 'value'
vlayer.valueRelation(12).mAllowNull = False
vlayer.valueRelation(12).mOrderByValue = True
# vlayer.valueRelation(12).mAllowMulti = True
# vlayer.valueRelation(12).mFilterExpression = 'COALESCE( "fieldA", \'<NULL>\' )'
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