Don't assume that the last step of the XPath is an element name

In order to find the number of items in the model, the model did a
second query on the document representing the result set.
So, suppose the user queried for //a/b/c, the result set would contain
all the 'c' elements from the input document.
In order to find the number of items in the result set, it did a second
query with the expression  "count(/dummy:items/c)", where 'c' was
extracted from the last step in the original XPath expression

For simple expressions, this worked fine.

However, if the last step had a predicate such as "//c/parent::b" it
didn't work.

The solution is to not filter *again* the last step when we query for
the count, since we know that all result items are direct children of
"dummy:items", and instead just execute the query
"count(dummy::items/*)".

This should also potentially improve performance.

Task-number: QTBUG-17588
Change-Id: Ib2fdf1ec8b91022df0597e089ad34d34b04428b0
Reviewed-by: Alan Alpert <aalpert@blackberry.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickxmllistmodel/tst_qquickxmllistmodel.cpp b/tests/auto/quick/qquickxmllistmodel/tst_qquickxmllistmodel.cpp
index 847cc5078d..1f7a8029dc 100644
--- a/tests/auto/quick/qquickxmllistmodel/tst_qquickxmllistmodel.cpp
+++ b/tests/auto/quick/qquickxmllistmodel/tst_qquickxmllistmodel.cpp
@@ -101,6 +101,7 @@ private slots:
     void threading();
     void threading_data();
     void propertyChanges();
+    void selectAncestor();
 
     void roleCrash();
 
@@ -964,6 +965,18 @@ void tst_qquickxmllistmodel::propertyChanges()
     delete model;
 }
 
+void tst_qquickxmllistmodel::selectAncestor()
+{
+    QQmlComponent component(&engine, testFileUrl("groups.qml"));
+    QAbstractItemModel *model = qobject_cast<QAbstractItemModel *>(component.create());
+    QVERIFY(model != 0);
+    QTRY_COMPARE(model->rowCount(), 1);
+
+    QModelIndex index = model->index(0, 0);
+    QCOMPARE(model->data(index, Qt::UserRole).toInt(), 12);
+    QCOMPARE(model->data(index, Qt::UserRole+1).toString(), QLatin1String("cats"));
+}
+
 void tst_qquickxmllistmodel::roleCrash()
 {
     // don't crash