QTreeModel->setRootIndex when using QSortFilterProxyModel segfaults

[killerwookie99]

So this works when I don't use a QSortFilterProxyModel but when I make QTreeView use a QSortFilterProxyModel, the compiled code seg faults...

QTreeView *treeView = new QTreeView();
QDirModel *dirModel = new QDirModel();
QSortFilterProxyModel *proxyDirModel = new QSortFilterProxyModel();
 
proxyDirModel->setSourceModel(dirModel);
treeView->setModel(proxyDirModel);
 
// I have tried it both of these ways:
treeView->setRootIndex(dirModel->index("/"));
//treeView->setRootIndex(treeProxyModel->sourceModel()->index("/"));

QTreeView *treeView = new QTreeView();
QDirModel *dirModel = new QDirModel();
QSortFilterProxyModel *proxyDirModel = new QSortFilterProxyModel();

proxyDirModel->setSourceModel(dirModel);
treeView->setModel(proxyDirModel);

// I have tried it both of these ways:
treeView->setRootIndex(dirModel->index("/"));
//treeView->setRootIndex(treeProxyModel->sourceModel()->index("/"));

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How can I make this work? Right now it seems like having two QDirModels works without problems when I use one dirmodel and try to do this the right way I run into lots of problems and not a lot of good documentation...