Gtk.TreeViewColumn.prototype.add_attribute

function add_attribute(cell_renderer:Gtk.CellRenderer, attribute:String, column:Number):void {
    // Gjs wrapper for gtk_tree_view_column_add_attribute()
}

Adds an attribute mapping to the list in tree_column. The column is the column of the model to get a value from, and the attribute is the parameter on cell_renderer to be set from the value. So for example if column 2 of the model contains strings, you could have the "text" attribute of a Gtk.CellRendererText get its values from column 2.