Creating predefined values in field using PyQGIS

Question

I would like to make programmatically (with Python) the same thing than we can do directly in QGIS when you create a list of values for a field.

I would like to create a new field and specify a list of possible values for this field. I didn't find any function for that in the API. Is there anyone who has the solution?

Answer 1

You need to assign and configure a ValueMap widget to your layer's field in this way:

QGIS 3.x

fieldIndex = layer.fields().indexFromName( 'myField' )
editor_widget_setup = QgsEditorWidgetSetup( 'ValueMap', {
 'map': {'Description 1': 'value1', 
 'Description 2': 'value2'}
 }
 )
layer.setEditorWidgetSetup( fieldIndex, editor_widget_setup )

QGIS 2.x

fieldIndex = layer.fieldNameIndex( 'myField' )
layer.setEditorWidgetV2( fieldIndex, 'ValueMap' )
values = {u'Description 1': u'value1', 
 u'Description 2': u'value2', 
 u'Description 3': u'value3'}
layer.setEditorWidgetV2Config( fieldIndex, values )

• Jochen Schwarze: setEditorWidgetV2Config(...) works, but I get a deprecation warning, are there other approaches?
• Germán Carrillo: Added a note showing how to configure Value Maps for QGIS3.
• Hicham Zouarhi: @GermánCarrillo is there a way to set a function from .qgis2\python\expressions instead of value1 ?
• ayar anasse: Is it possible to have multiple selection option with map value ?
• Germán Carrillo: I don't think so. You would need to use Value Relation for that.