QTableView problems with row - qt

Question

Hello guys i new to QT and i am doing Qtableview to add information in 3 columns to infinite row like
|--1--|--2--|--3--|
|--1--|--2--|--3--|
|--1--|--2--|--3--|
this is how i want to insert/append row but this is how i am getting after insert/append row functions.
|--1--|--2--|--3--|
|-----|-----|-----||--1--|--2--|--3--|
|-----|-----|-----||-----|-----|-----||--1--|--2--|--3--|
i am getting empty gaps and increased column count
i am using QStandardItemmodel for model this is code that creates the model item
void tableview::add_tableview() //this is used to add data to tableview
{
//to get data from line edit in add window
QStandardItem *item_1 = new QStandardItem(QString(enter1_edit->text()));
QStandardItem *item_2 = new QStandardItem(QString(enter2_edit->text()));
QStandardItem *item_3 = new QStandardItem(QString(enter3_edit->text()));
list << item_1 << item_2 << item_3;
model->appendRow(list);
//to set the model
main_tableview->setModel(model);
}
The values in the rows are added using qlineedit enter1_edit,enter2_edit & enter3_edit(its in other function/method)
main_tableview is the object of qtableview
Thanks for helping me!

Answer 1

Ding Ding Ding, I have it.
I tried to reproduce your problem without success unil I tried something...suboptimal :).
Is your list by any chance a global entity? If yes (and I assume it is) you keep adding items to it.
First time you call add_tableview() all is good, list is empty, gets three QStandardItem pointers added and is used to append a row with those three items. So far so god.
You call add_tableview() again, now you create another three QStandardItems and APPEND them to the list (which still contains the three from the last call). Invoking appendRow() actually tries to insert six items, from which the first three allready exist in the model. And as you know you mustn't add the same item pointer to a model twice. Thankfully Qt doesn't crash but inserts three empty columns for the item pointers allready in it.
Solution: At the end of your add_tableview() method call list.clear() or use a local variable for the list. The overhead should be minimal.
Best regards
D