How to fill an inserted column with data?

[croo]

Hello everyone.

I want to insert a new column in a model, then fill it up with data.
The problem below is the simplified one: The model already contains 5 column from a database, filled with data.
All it want to do is insert a column, and fill each new index with the string "BLA".

The model is a QSqlTableModel.

void ReadersRoom::doPaidColumn()
{
	model->insertColumn(5);
	model->setHeaderData(5,Qt::Horizontal,trUtf8("Paid"));
 	QString s = "BLA";
 
	for(int i = 0; i < model->rowCount(); ++i)
	{
    	      QModelIndex index = model->index(i,5);
    	      if(index.isValid())                                 // index is valid.
    	            model->setData(index,s);                      // returns TRUE.
    	      QString test = model->index(i,5).data().toString(); // STRING IS EMPTY!
 	}
}

void ReadersRoom::doPaidColumn()
{
	model->insertColumn(5);
	model->setHeaderData(5,Qt::Horizontal,trUtf8("Paid"));
 	QString s = "BLA";

	for(int i = 0; i < model->rowCount(); ++i)
	{
    	      QModelIndex index = model->index(i,5);
    	      if(index.isValid())                                 // index is valid.
    	            model->setData(index,s);                      // returns TRUE.
    	      QString test = model->index(i,5).data().toString(); // STRING IS EMPTY!
 	}
}

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The result(on a tableview):
the new column is there and it contains nothing.

If I try to rewrite the 4th column with this method it works fine. But the setData won't put any data in the newly added column.

What am I doing wrong?