Finding a item in second column of treeView

Hi.
The topic was discussed couple of time on this forum, but not in the way that satisfies me.
My tree looks like

Code:

---

name DESC
  |-> ENTRY         ID_100  
    |-> ENTRY       ID_101
    |-> ENTRY_2     ID_102
      |-> ENTRY_2   ID_103

---

It has 2 columns, first with name and second with ID (unique) what I want to do is to find index of ENTRY, when having only ID, and I really don't know how to do that.
I'm now trying to use the match() function but with no success. When I look for text in first column everything works great.
Code

Code:

---

QModelIndexList Items = model->match(
                model->index(0, 0),
                Qt::DisplayRole,
                QVariant::fromValue(QString("ENTRY_2")),
                -1,
                Qt::MatchRecursive);

---

returns me indexes of all entries with same text, but changing code to

Code:

---

QModelIndexList Items = model->match(
                model->index(0, 1),
                Qt::DisplayRole,
                QVariant::fromValue(102),
                -1,
                Qt::MatchRecursive);

---

results in empty list of indexes.
Is there a simple way to find index of "ENTRY" by finding the ID?

In your example the DisplayRole of the second column would be QVariant("ID_102") not QVariant(102). If that was not done for illustrative purposes then this may be why your result set is empty.

ID in my code is the same in tree and in code.
The "ID_" tag in my "visual" illustration is only for shoving that this is ID column not a text from NAME column :) in real life is equal to "102"

Show us the implementation for data(), please.

I've manage to solve my problem by changing sqlQuery, to get not only ID but also name. Then I look for entries that match my groupName, and then for every match I check second column for fit with the ID.

Code:

---

currentGroupID = query.value("groupID").toInt();
QAbstractItemModel *model = ui->groupTree->model();
QModelIndexList Items = model->match(
            model->index(0,0),
            Qt::DisplayRole,
            QVariant::fromValue(QString(query.value("groupName").toString())),
            -1,
            Qt::MatchRecursive);
if (Items.size() == 1){
    // Only 1 group with this name ID must match
    doSomethingWithGroup(Items.first());
}
else{
    for(int i=0;i<Items.size();i++){
        QModelIndex parent = Items.at(i).parent();
        int tmpGroupID = Items.at(i).model()->index(0,1,parent).data().toInt();
        if (tmpGroupID == currentGroupID){
            doSomethingWithGroup(Items.at(i));
            break;
        }
    }
}

---

It work for me but, the main topic still remains unsolved.
I use QStandardItemModel so data() is a buildin function.

Ok. The default implementation of match() only searches in a column (as documented). The only column in which a recursive search makes sense is column 0 (the only one with a hierarchy) and that column does not contain the values you are seeking. You need to provide a reimplementation of match() if you wish to recurse down column 0 but search a different (or all) columns in each row.

You could also/instead store the ID on the Qt::UserRole of the item in column 0 to allow match() to search that way.

Code:

---

#include <QApplication>
#include <QStandardItemModel>
#include <QTreeView>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QStandardItemModel model;
 
    for (int i = 0; i < 4; ++i) {
        QStandardItem *parentItem = model.invisibleRootItem();
        for (int j = 0; j < 3; ++j) {
            QStandardItem *item0 = new QStandardItem(QString("item %0").arg(j));
            item0->setData(100 + j, Qt::UserRole);
            QStandardItem *item1 = new QStandardItem(QString::number(100 + j));
            parentItem->appendRow(QList<QStandardItem*>() << item0 << item1);
            parentItem = item0;
        }
    }
 
    QModelIndexList matches = model.match(
                model.index(0,0),
                Qt::UserRole,
                QVariant(102),
                -1,
                Qt::MatchRecursive);
 
    QTreeView view;
    view.setModel(&model);
    view.show();
    view.expandAll();
    foreach (const QModelIndex &match, matches)
        view.selectionModel()->select(match, QItemSelectionModel::Select);
 
    return a.exec();
}

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