Qtableview sorting issue

eswaramrth03

I am using qtableview to dispaly the data in my application . The data are stored in the QStandardItemModel . For sorting my data, i am using the following function

QStandardItemModel *grpModel;
grpModel->sort(1,Qt::AscendingOrder);

Qtableview also have editing option , While editing the sorting will not work well, Please check the below image

sometimes i am having following error and application crashed

Please give the solution for this.

jsulm

@eswaramrth03 said in Qtableview sorting issue:

QStandardItemModel *grpModel;
grpModel->sort(1,Qt::AscendingOrder);

You know that you have to assign a valid pointer to grpModel? C++ basics.

QStandardItemModel *grpModel = new QStandardItemModel();
grpModel->sort(1,Qt::AscendingOrder);

eswaramrth03

@jsulm
i am done on the same way only.

jsulm

@eswaramrth03 said in Qtableview sorting issue:

i am done on the same way only

What do you mean? Do you mean you do it like I did and still have the crash?
Did you use debugger to get more information about the crash?
Do you have a stack trace after crash?

eswaramrth03

@jsulm i already assign the valid pointer as mention like you. If i debug my application , sometimes it will show the below message in the sort function line. If you press abort or retry it will lead to crash the application
. if it will not show the message means the wrong order will be displayed in the view as below.

i am converting Qstring to double for my application and store it in to list for my application calculation on backend.

jsulm

@eswaramrth03 said in Qtableview sorting issue:

If i debug the my application , it will show the below message

Please post the stack trace. How else should anybody know why it crashes?

nagesh

@eswaramrth03 first column is sorted in "string order", as data in the first column is QString.
How did you populate model data?
check for the answer in the following thread for the sorting.
https://forum.qt.io/topic/115420/sorting-numerical-values-in-qtableview-with-widgets

VRonin

@nagesh Agreed!

Basically always avoid using the constructors QStandardItem(const QIcon &icon, const QString &text) and QStandardItem(const QString &text) as most of the times they don't do what you want them to do

eswaramrth03

@VRonin i didn't use constructor as mention like you. In one case , I didn't get error as well as sort issue

If you give two digits instead of one digits , it will give proper result. Sample data

00
05
09
11
20
instead of
0
5
9
11
20

But in my application the user input should be either one digit or two digit.

VRonin

This is because you are storing numbers as stings so they get sorted in alphabetical order. Do not convert numbers to strings

JonB

@eswaramrth03
As @VRonin has said. Please read the link @nagesh gave you and follow that QStandardItem::setData() pattern to correctly store numbers.