Foremost a fix for SmTreeModel

Not working again, but I eventually have to commit the changes. Fixes to
SmTreeModel:

* Fix SmTreeModel::index(). The previous comment was quite valid. I'm
surprised that it worked at all. I have no clue why to return an invalid
QModelIndex if the column isn't 0. Now an index with any valid column
number can be created.

* Fix SmTreeModel::parent(). Again, why shouldn't we create a parent
index with a column other than 0? No idea...

* Fix SmTreeModel::headerData(). Add some sanity checks.

* Fix SmTreeModel::findRecursive(). Well, what is there to say. It never
worked for models with a depth > 1, but obviously it didn't really
matter until now. To make it work I had to change SmTreeItem as well.
SmTreeItem::next() returns the next valid parent/sibling, or 0 if there
isn't one.

There may be some fallout from these changes, but they're yet to be
seen.

Changes to PictureView:
* fix selecting an item according to the new datasbase layout
* same goes for editing items. If an update actually works has to be
checked.

Overall, it's an intermediate commit that should have been a sane series
of commits. Can't be changed now...

1 files changed, 45 insertions, 4 deletions

diff --git a/pictureswidget.cpp b/pictureswidget.cpp
index d5caa76..bc4b143 100644
--- a/pictureswidget.cpp
+++ b/pictureswidget.cpp
@@ -72,8 +72,13 @@ void PicturesWidget::readSettings(){
 }
 
 void PicturesWidget::editMappings(){
-    QList<int> currentMappings = mPictureView->fileMappings();
-    mEditDialog->editWidget()->setMappings(currentMappings);
+    QModelIndexList selectedFids = mPictureView->selectionModel()->selectedRows(PicFilesModel::Id);
+    QList<int> fileIds;
+    foreach(QModelIndex idx, selectedFids){
+        fileIds << idx.data().toInt();
+    }
+    QList<MappingData> mappings = mPictureView->filesModel()->mappingDataFromFiles(fileIds);
+    mEditDialog->editWidget()->setMappings(mappings);
     int retval = mEditDialog->exec();
     if(retval == QDialog::Accepted){
         QList<int> selMappings = mEditDialog->editWidget()->mappingIds();
@@ -272,12 +277,14 @@ PicFilesModel::PicFilesModel(const QStringList &headers, QObject *parent) : SmTr
     //setup database
     mDb = QSqlDatabase::database("treedb");
     mPopulateQS = QString("SELECT DISTINCT(pics.ipicsid), pics.tfilename, pics.isize, pics.tformat, pics.dtadded, pics.cmd5sum FROM pics, pics_mappings2 WHERE pics_mappings2.imappings_parents_id IN (%1) AND pics_mappings2.ipics_id = pics.ipicsid ORDER BY pics.tfilename");
+    mMappingsQS = QString("SELECT DISTINCT(pics_mappings2.imappings_parents_id) FROM pics_mappings2, pics WHERE pics_mappings2.ipics_id IN (%1)");
     mDeleteFileQ = new QSqlQuery(mDb);
     mDeleteFileQ->prepare("DELETE FROM pics WHERE ipicsid = :id");
     mDeleteMappingsQ = new QSqlQuery(mDb);
-    mDeleteMappingsQ->prepare("DELETE FROM pics_mappings WHERE ipics_id = :id");
+    mDeleteMappingsQ->prepare("DELETE FROM pics_mappings2 WHERE ipics_id = :id");
     mAddMappingsQ = new QSqlQuery(mDb);
-    mAddMappingsQ->prepare("INSERT INTO pics_mappings(ipics_id, imapping_id) VALUES(:pid, :id)");
+    mAddMappingsQ->prepare("INSERT INTO pics_mappings2(ipics_id, imapping_id) VALUES(:pid, :id)");
+
 }
 
 PicFilesModel::~PicFilesModel(){
@@ -399,6 +406,40 @@ bool PicFilesModel::changeMappings(const QList<int> &fileIds, const QList<int> &
     return false;
 }
 
+QList<MappingData> PicFilesModel::mappingDataFromFiles(const QList<int> fileIds) const{
+    QList<int> parentIds = mappingPIdsFromFiles(fileIds);
+    if(parentIds.isEmpty()){
+        return QList<MappingData>();
+    }
+    QList<MappingData> retval;
+    foreach(int pId, parentIds){
+        QModelIndex curIdx =  mMappingTreeModel->findRecursive(pId, MappingTreeModel::MapParentId, mMappingTreeModel->rootIndex());
+        MappingData curData;
+        curData.id = curIdx.data(MappingTreeModel::IdRole).toInt();
+        curData.name = curIdx.data(MappingTreeModel::NameRole).toString();
+        curData.path = mMappingTreeModel->path(curIdx);
+        retval << curData;
+    }
+    return retval;
+}
+
+QList<int> PicFilesModel::mappingPIdsFromFiles(QList<int> fileIds) const{
+    if(fileIds.isEmpty()){
+        return QList<int>();
+    }
+    QStringList idList;
+    foreach(int id, fileIds){
+        idList << QString::number(id);
+    }
+    QString query = mMappingsQS.arg(idList.join(","));
+    QSqlQuery q(query, mDb);
+    QList<int> retval;
+    while(q.next()){
+        retval << q.value(0).toInt();
+    }
+    return retval;
+}
+
 void PicFilesModel::populate(){
     SmTreeItem *root = new SmTreeItem(NumFields);
     QStringList idList;