QSqlRelationalTableModel doesn't edit all rows after filtering

[slobo_n]

Hi all.
The problem is at the bottom.
First i create my tables:

query.exec("CREATE TABLE grupi("
		"grupa_id INT PRIMARY KEY IDENTITY(1,1) NOT NULL,"
		"grupa VARCHAR(10) NULL UNIQUE);");
query.exec("CREATE TABLE contacts("
		"contact_id INT PRIMARY KEY IDENTITY(1,1) NOT NULL,"
		"FirstName VARCHAR(30) NULL,"
		"LastName VARCHAR(30) NULL,"
		"grupaId INT NOT NULL,"
		" FOREIGN KEY (grupaId) REFERENCES grupi);");
 query.exec("insert into grupi values('VIP')");
 query.exec("insert into grupi values('Family')");
 query.exec("insert into grupi values('Ungrouped')");
 query.exec("insert into grupi values('Work')");

query.exec("CREATE TABLE grupi("
		"grupa_id INT PRIMARY KEY IDENTITY(1,1) NOT NULL,"
		"grupa VARCHAR(10) NULL UNIQUE);");
query.exec("CREATE TABLE contacts("
		"contact_id INT PRIMARY KEY IDENTITY(1,1) NOT NULL,"
		"FirstName VARCHAR(30) NULL,"
		"LastName VARCHAR(30) NULL,"
		"grupaId INT NOT NULL,"
		" FOREIGN KEY (grupaId) REFERENCES grupi);");
 query.exec("insert into grupi values('VIP')");
 query.exec("insert into grupi values('Family')");
 query.exec("insert into grupi values('Ungrouped')");
 query.exec("insert into grupi values('Work')");

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The model gets populated, and i can see all of the contacts in the database:

dataManagementModel = new QSqlRelationalTableModel(this);
dataManagementModel->setTable("contacts");	
dataManagementModel->setRelation(3, QSqlRelation("grupi", "grupa_id", "grupa"));
dataManagementModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
bool ok1 = dataManagementModel->select();

dataManagementModel = new QSqlRelationalTableModel(this);
dataManagementModel->setTable("contacts");	
dataManagementModel->setRelation(3, QSqlRelation("grupi", "grupa_id", "grupa"));
dataManagementModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
bool ok1 = dataManagementModel->select();

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The problem:
After i have created the tables and populate them with some data, the problem is when i want to delete a group. If i want to delete a group, first the contacts that were in that group must be set to another group. Let say to 'Ungrouped'. The code for this action is:

void DataManagement::setContactsToDefaultGroup(QModelIndex oldData, QModelIndex newData)
{
dataManagementModel->setFilter("grupaId = " + oldData.data().toString()); //to get only the contacts that are in the group that's going to be deleted
bool ok = dataManagementModel->select();
int rowsCounted = dataManagementModel->rowCount();
for (int row = 0; row < rowsCounted; row++)
{
	QModelIndex indexForUpdate;
	QSqlRecord rec = dataManagementModel->record(row);
	QString name = rec.value(1).toString();              //after some time it doesn't read the name
	indexForUpdate = dataManagementModel->index(row, 3, QModelIndex());   //gives invalid index after some time
	dataManagementModel->setData(indexForUpdate, newData.data().toInt());
	QSqlError h = dataManagementModel->query().lastError();
	bool b = dataManagementModel->submitAll();
	Q_ASSERT(b);
}
	dataManagementModel->setFilter("");  //to show all the contacts again
	dataManagementModel->select();
}

void DataManagement::setContactsToDefaultGroup(QModelIndex oldData, QModelIndex newData)
{
dataManagementModel->setFilter("grupaId = " + oldData.data().toString()); //to get only the contacts that are in the group that's going to be deleted
bool ok = dataManagementModel->select();
int rowsCounted = dataManagementModel->rowCount();
for (int row = 0; row < rowsCounted; row++)
{
	QModelIndex indexForUpdate;
	QSqlRecord rec = dataManagementModel->record(row);
	QString name = rec.value(1).toString();              //after some time it doesn't read the name
	indexForUpdate = dataManagementModel->index(row, 3, QModelIndex());   //gives invalid index after some time
	dataManagementModel->setData(indexForUpdate, newData.data().toInt());
	QSqlError h = dataManagementModel->query().lastError();
	bool b = dataManagementModel->submitAll();
	Q_ASSERT(b);
}
	dataManagementModel->setFilter("");  //to show all the contacts again
	dataManagementModel->select();
}

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This function can read and edit the first 2-3 contacts and fails. Is dataManagementModel used properly? How to move contacts from one group to another group?


As for convenience I have provided part of the code that you can build.