Reloading layer in Layers Panel with Python after modifying it in DB Manager

Question

I often have to reload layers in the layers panel after doing changes in the DB-Manager (add a column, delete a default value, ...). At the moment I use the changeDatasource plugin. Can this also be done using Python?

Germán Carrillo · Accepted Answer

I've read several answers for this specific question; none of them seems to work. The only effective solution I could find is:

layer.setDataSource( layer.source(), layer.name(), layer.providerType() )

Tested in QGIS v2.14.8.

christoph · Answer

if you have your layer as a variable, simply layer.reload()

You can obtain a list of all layers of the current project from  QgsMapLayerRegistry.instance().mapLayers()

If you don’t care about reloading all other layers at the same time, the one-liner

QgsMapLayerRegistry.instance().reloadAllLayers()

does the job, too.

References:

https://qgis.org/api/classQgsMapLayerRegistry.html
http://qgis.org/api/classQgsMapLayer.html

Romário Carvalho Neto · Answer

QgsProject.instance().reloadAllLayers() worked for me on QGIS 3.10.

Reloading layer in Layers Panel with Python after modifying it in DB Manager

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