fix: crash if relation is one-way

src/nut/core/abstracttableset.cpp

@@ -115,4 +115,9 @@ void AbstractTableSet::setDatabase(Database *database)
     data->database = database;
 }
 
+int AbstractTableSet::size() const
+{
+    return data->childs.size();
+}
+
 NUT_END_NAMESPACE

src/nut/core/abstracttableset.h

@@ -48,6 +48,8 @@ public:
     Database *database() const;
     void setDatabase(Database *database);
 
+    int size() const;
+
 protected:
     QExplicitlySharedDataPointer<AbstractTableSetData> data;
 

src/nut/core/query.h

@@ -350,12 +350,14 @@ Q_OUTOFLINE_TEMPLATE RowList<T> Query<T>::toList(int count)
             //create table row
             Row<Table> row;
             if (data.table->className() == d->className) {
-                row = Nut::create<T>();
+                Row<T> tmpRow = Nut::create<T>();
+                row = tmpRow.template objectCast<Table>();
+
                 row->init();
 #ifdef NUT_RAW_POINTER
                 returnList.append(dynamic_cast<T*>(table));
 #else
-                returnList.append(row.objectCast<T>());
+                returnList.append(tmpRow);
 #endif
                 d->tableSet->add(row);
 

src/nut/generators/abstractsqlgenerator.cpp

@@ -258,14 +258,14 @@ QStringList AbstractSqlGenerator::diff(TableModel *oldTable, TableModel *newTabl
             columnSql << declare;
         }
     }
-//    Q_FOREACH (QString fieldName, relations) {
+//    for (auto &fieldName: relations) {
-//        RelationModel *newRelation = newTable->foregionKeyByField(fieldName);
+//        RelationModel *newRelation = newTable->foreignKeyByField(fieldName);
 //        if (oldTable) {
-//            RelationModel *oldRelation = oldTable->foregionKeyByField(fieldName);
+//            RelationModel *oldRelation = oldTable->foreignKeyByField(fieldName);
 
-//            QString buffer = diff(oldRelation, newRelation);
+//            auto buffer = diff(oldRelation, newRelation);
-//            if (!buffer.isNull())
+//            if (buffer.size())
-//                columnSql << buffer;
+//                columnSql.append(buffer);
 //        } else {
 //            columnSql << relationDeclare(newRelation);
 //        }

src/nut/generators/sqlitegenerator.cpp

@@ -176,16 +176,23 @@ QStringList SqliteGenerator::diff(TableModel *oldTable, TableModel *newTable)
                             SELECT id,
                                    t,
                                    m
-                              FROM sqlitestudio_temp_table;
+                              FROM nut_orm_temp_table;
 
     DROP TABLE sqlitestudio_temp_table;
     */
 
-    ret.append(QStringLiteral("ALTER TABLE ") + newTable->name() + QStringLiteral(" RENAME TO sqlitestudio_temp_table;"));
+    QString foreignKeys;
+    for (auto &f: newTable->foreignKeys()) {
+        if (!foreignKeys.isEmpty())
+            foreignKeys.append(QStringLiteral(", "));
+        foreignKeys.append(QStringLiteral("FOREIGN KEY(%1) REFERENCES %2(id)")
+                           .arg(f->localColumn, f->masterTable->name()));
+    }
+    ret.append(QStringLiteral("ALTER TABLE ") + newTable->name() + QStringLiteral(" RENAME TO nut_orm_temp_table;"));
     ret.append(newTableSql);
-    ret.append(QStringLiteral("INSERT INTO %1 ( %2 ) SELECT %2 FROM sqlitestudio_temp_table;")
+    ret.append(QStringLiteral("INSERT INTO %1 ( %2 ) SELECT %2 FROM nut_orm_temp_table;")
                .arg(newTable->name(), columns));
-    ret.append(QStringLiteral("DROP TABLE sqlitestudio_temp_table;"));
+    ret.append(QStringLiteral("DROP TABLE nut_orm_temp_table;"));
     return ret;
 }
 void SqliteGenerator::appendSkipTake(QString &sql, int skip, int take)

tests/auto/tst_json/tst_json.pro

@@ -4,7 +4,8 @@ TARGET = tst_upgrades
 TEMPLATE = app
 CONFIG   += warn_on c++11
 
-include(../common/nut-lib.pri)
+#include(../common/nut-lib.pri)
+include(/doc/dev/qt/Nut/src/nut/nut.pri)
 
 SOURCES +=  \
     tst_json.cpp \