qgis - How to change the edit widget for fields in a layer with PyQGIS?

Is possible change the edit widget with PyQGIS?

I have made an extension that loads a PostGIS layer and I want to edit the date fields with the date widget by default without any change in the settings of layer ( "layer properties dialog").

Answer

You can use the method setEditorWidgetV2() from QgsVectorLayer.

To set the edit widget of a field to DateTime, do this:

vLayer.setEditorWidgetV2( fieldIndex, 'DateTime' )

Parameters can be set via a dictionary of key-values, like this:

vLayer.setEditorWidgetV2Config( fieldIndex, {'display_format': 'yyyy-MM-dd', 'allow_null': False, 'field_format': 'yyyy-MM-dd', 'calendar_popup': True})

You can find a description of the available options at the QgsDateTimeEditWrapper documentation.

A list of available widgets can be found here.

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On the other hand, if you want all your Date fields to have the DateTime edit widget, you could do something like this:

fields = vLayer.dataProvider().fields()

dateFields = []
# Get indices of date fields
for field in fields: 
    if field.typeName() == 'Date':
        dateFields.append( vLayer.fieldNameIndex(field.name()) )

# Set the DateTime editor widget for date fields
for dateField in dateFields:
    vLayer.setEditorWidgetV2( dateField, 'DateTime' )