Accessing Attribute Table (in composer) with PyQgis

Question

I have a QGIS (3.44) project containing a composer. In this composer i inserted an attribute table (which i've given the item_id 'tab').

I would like to be able to access this attribute table properties using PyQgis. I'm using the following code so far :

projectInstance = QgsProject.instance()
projectLayoutManager = projectInstance.layoutManager()
at=projectLayoutManager.layouts()[0].itemById('tab')

The last line returns a QgsLayoutFrame which is a bit misleading for me ...

How can i 'browse' the content of this QgsLayoutFrame to reach my attribute table ?

Answer 1

you need acces to QgsLayoutMultiFrame object.

Example code with some extras

# Table Sample
tabla = layout.itemById('tabla')
tabla_item = tabla.multiFrame ()      
tabla_item.setVectorLayer(<my_layer>)
tabla_item.setDisplayedFields(["column_0","column_1"])

column_0 = tabla_item.columns()[0]
# Change heading name column 0
column_0.setHeading("New name 0")

column_1 = tabla_item.columns()[1]
# Change heading name column 1
column_1.setHeading("New name 1")
# Change order column 0
column_0.setSortOrder(Qt.AscendingOrder)