PyQGIS – Resolving AttributeError for QgsVectorLayer Object FieldNameIndex

pyqgisqgis-3

When I try to calculate a new field. I receive the following error:

idx = self.layer.fieldNameIndex(attributeName)
AttributeError: 'QgsVectorLayer' object has no attribute 'fieldNameIndex'

What´s the problem? I'm using QGIS 3.0.1 64x in windows.

Best Answer

in python 3: use

fields().lookupField()

or fields().indexFromName()

example:

idx= layer.fields().indexFromName(attributeName)

Related Solutions

[GIS] AttributeError: ‘NoneType’ object has no attribute ‘dataProvider’

You could use the following to add a new field and determining its type:

from PyQt4.QtCore import *

layer = qgis.utils.iface.activeLayer()
layer.startEditing()
layer.dataProvider().addAttributes( [ QgsField("Name", QVariant.String) ] )
layer.commitChanges()

PyQGIS AttributeError – ‘NoneType’ Object Has No Attribute ‘pushButton’

You set self.dockwidget=None, And then you connect a method to "the click event of the push button item of None object". So that you get that error.

 self.dockwidget = None
 # Now, self.dockwidget is None and None object has no any pushButton item.
 self.dockwidget.pushButton.clicked.connect(self.Find()) # <- CUT THIS LINE

You should add self.dockwidget.pushButton.clicked.connect(self.Find()) line, after creating a QDockWidget object which has QPushButton object. (GIS_IFEDockWidget() in your case ).

So add that line after self.dockwidget = GIS_IFEDockWidget() line within run method:

def run(self):
    """Run method that loads and starts the plugin"""

    if not self.pluginIsActive:
        self.pluginIsActive = True

        #print "** STARTING GIS_IFE"
        if self.dockwidget == None:
            # Create the dockwidget (after translation) and keep reference
            self.dockwidget = GIS_IFEDockWidget()

        self.dockwidget.pushButton.clicked.connect(self.Find()) # <- ADD RIGHT HERE

        # connect to provide cleanup on closing of dockwidget
        self.dockwidget.closingPlugin.connect(self.onClosePlugin)
        .
        .

Best Answer

Related Solutions

[GIS] AttributeError: ‘NoneType’ object has no attribute ‘dataProvider’

PyQGIS AttributeError – ‘NoneType’ Object Has No Attribute ‘pushButton’

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