Removing rows from TableModel

[SGaist]

Hi and welcome to devnet,

Just to be sure I understand your question correctly, are you asking us to review your code and explain it to you ?

[theo_ld]

@SGaist I said this code was coming from Qt Address Book Example. I've tried it, but I'd like to change some features.
By the way, i'm not sure to understand how the TableModel works. I tried to clear it but

table->removeRows(0, table->rowCount(QModelIndex()));

doesn't work. So yes, can you clarify me this example ?

[JonB]

@theo_ld

table->removeRows(0, table->rowCount(QModelIndex()));

doesn't work. So yes, can you clarify me this example ?

What does "doesn't work" mean? Compile error? Runtime error? Not the behaviour you expected? ...

1. What is your table->editStrategy()? Docs state that only OnManualSubmit allows mutliple-row deletion. And then you'll need a submitAll().
2. Check the return result of your table->removeRows(), and lastError() if that's false.
3. I think table->clear() is a quick way of deleting all rows, though that may not affect what you are wanting to learn about.

[theo_ld]

I run through a Runtime Error ! I'm trying to fix it with your advice ! I believe the

table->clear()

method doesn't exist in TableMethod btw ;) Can you use

table->removeRows()

it if the table is empty ?

[JonB]

@theo_ld

So tell us the runtime error! And/or check the return result + lastError()!

clear method: what is your TableModel derived from?

[theo_ld]

@JNBarchan

My TableModel comes from QAbstractTableModel.
lastError() works only for SQL Databases right ? Which object is it stored in ?
Can't check the return of the function because I get a runtime error.

Here is the console output

Debugging starts
ASSERT: "last >= first" in file itemmodels\qabstractitemmodel.cpp, line 2743
Debugging has finished

[JonB]

@theo_ld
Yeah, I had assumed QSqlTableModel....

ASSERT: "last >= first" in file itemmodels\qabstractitemmodel.cpp, line 2743

I would guess this is telling you that your start row number + number of rows >= last row in table.

So: look at value of table->rowCount(QModelIndex()). Is it 0? In which case, if there are 0 rows, no, you cannot delete any rows from an empty table, even if you specify a count of 0 rows to delete. At a guess!

P.S.
Also, QAbstractTableModel requires you to subclass (TableModel), and unless that has implemented removeRows() is does nothing? You sure the example which did work did not use removeRow() (note the spelling)?

[theo_ld]

@JNBarchan You might be right, so I added a condition and it doesn't runtime anymore.

Although, my user isn't visible at all in the graphical interface -_-.
Trying to fix this problem now :p

[JonB]

@theo_ld said in Removing rows from TableModel:

@JNBarchan You might be right, so I added a condition and it doesn't runtime anymore.

In that case, I'd suggest I was right... ;-)

[theo_ld]

This post is deleted!