Fastest way to to update QTreeView

[Qt Enthusiast]

I have a QTreeeView and

colData1         coldata2        colData3
A
     B                     9999          77777
     C                   88888         66666

Now

In my internal data Row C and ColData3 value is changed to 888888

Now what is fastest way I notify the value of column has changed

is updateModel(true) will work

[raven-worx]

@Qt-Enthusiast
emit the dataChanged() signal (in the model)