Hi All,
I'm trying to write a short plugin and I've been using the PyConsole to test
code snip-its. I'm having trouble deleting a column that I've created in a
table (even in the attribute table GUI - the delete column button is
inactive even though the add table column is active and the layer is
editable). Here's the code I've used to create the column;
import qgis.core
import qgis.gui
import PyQt4.QtCore
import PyQt4.QtGui
vlayer = qgis.utils.iface.activeLayer()
provider = vlayer.dataProvider()
feat = QgsFeature()
newField = QgsField("azimuth",QVariant.Double)
provider.addAttributes([newField])
newFieldIndex = provider.fieldNameIndex(newField.name())
vlayer.commitChanges()
When I try to use the following code to delete the column, the function
returns 'false';
provider.deleteAttributes([newFieldIndex])
I had a look at the API and apparently some constant called
'QgsAttributeIds', an 'int', is expected by the deleteAttributes() function.
I've tried a few variations of this with no success and according to the API
it seems that all the deleteAttributes() function does is to return 'false'
(http://www.qgis.org/api/qgsvectordataprovider_8cpp-source.html#l00104).
What is the correct Python code to delete a column in the PyConsole? Thanks,
Chris
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