GroupDataModel how to search for an item and row

Hi all!

I have a problem with GroupDataModel.

I create and fill out the template as below:


m_model = new GroupDataModel(QStringList() << "displayName", this);
...
QVariantMap entry;
entry["contactId"] = QString::number(contact->getId());
entry["displayName"] = contact->getDisplayName();
entry["icon"] = contact->getSmallPhoto();

m_model->insert(entry);

After I cath some report like contactDeleted (int id) and want to remove the related item of the model:

void ContactsViewModel::onContactDeleted(int id)
{
  //QVariantList indexPath = m_model->lowerBound(QVariantList() << QString::number(id));
  //QVariantList indexPath = m_model->lowerBound(QVariantList() << id);
  //QVariantList indexPath = m_model->find(QVariantList() << QString::number(id));
  QVariantList indexPath = m_model->find(QVariantList() << id);

  if (!indexPath.isEmpty())
  {
    m_model->removeAt(indexPath);
  }
}

But model will always return row to the first article! I used and GroupDataModel::find and GroupDataModel::lowerBound, but result is still the same!

Please help me, how can I find point correct?

Hello

My understanding of the documentation, it is possible to search only the fields that are in sortingKeys.

I think that GroupDataModel is the construction of indexes on these areas.

I did some tests:

If displayName is present in sort keys:

    GroupDataModel *model = new GroupDataModel(QStringList() << "displayName", this);

    QVariantMap entry;
    entry["contactId"] = "100";
    entry["displayName"] = "Alex";
    entry["icon"] = "icon1.png";
    model->insert(entry);

    entry["contactId"] = "200";
    entry["displayName"] = "Andrew";
    entry["icon"] = "icon2.png";
    model->insert(entry);

then by displayName will work correctly:

QVariantList indexPath = model->find(QVariantList() << "Andrew");
qDebug() << "indexPath" << indexPath << "\n";
// this will print (QVariant(int, 0) ,  QVariant(int, 1) ) which is
// section 0, item 1

But research by contactId won't work, because it is not present in sortingKeys.

If you add contactId to sortingKeys:

GroupDataModel *model = new GroupDataModel(QStringList() << "displayName" << "contactId", this);

then by searching only by displayName will no longer work. Find() maps values to keys, it will only return entries with empty contactId. But lowerBound() can be used instead:

QVariantList indexPath = model->lowerBound(QVariantList() << "Andrew");
qDebug() << "indexPath" << indexPath << "\n";
// this will return:
// indexPath (QVariant(int, 0) ,  QVariant(int, 1) )

Please note that the lowerBound is not a complete replacement for find. It returns a suggested for element insertion index. So if she is unable to find a match, it will return (0, 0) like suggested insertion point, but not a row empty.

When you have multiple sort keys the code depending on type of work to find a name:

    GroupDataModel *model = new GroupDataModel(QStringList() << "displayName" << "contactId", this);

    QVariantMap matchMap;
    //matchMap["contactId"] = "200";
    matchMap["displayName"] = "Andrew";
    QVariantList indexPath = model->lowerBound(matchMap);
    qDebug() << "indexPath" << indexPath << "\n";

But if the name is not found lowerBound will return (0, 0) - a proposed insertion point. Is not possible to differentiate the value of return "not found".

But if you try to provide a contactId

    matchMap["contactId"] = "200";
    //matchMap["displayName"] = "Andrew";

It will not work, because it searches in the order in which the sortingKeys have been reported.

In this case, it will try to 'empty' QVariant DisplayName of match, find nothing and will be (0, 0) return as insertion point proposed without even trying to match contactId-s.

The find() function is not appropriate as well because it performs the exact match on all fields and requires that all sortingKeys to be defined.

I hope I have not confused you completely now!

So, the conclusion seems to be:

Find() cannot find an exact match and compared all the keys of the supplied with keys in sortingKeys. If values are omitted it is expected that they are NULL in the model.

lowerBound() returns a suggested insertion or (0, 0) point, if nothing has been put in correspondence. He compares the values passed to it with the sort of keys from left to right (if the first sortingKey did not match it does not compare).

If these methods are not well suited for finding a specific key value. A possible workaround is an iteration model entries manually and by comparing their values, but it's slow.

I suggest to create your own datamodel by inheriting from the class DataModel. It is not very difficult, and you can implement any kind of search in there.

Tags: BlackBerry Developers

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