Subclassing QAbstractTableModel - qt

Question

I have subclassed a QAbstractTableModel to represent data from a QMap. This QMap has QLists of QSqlRecords and this map is modified by some other part of my code. I want to use this model with a QTableView to display the sql records in this map for each key. Here is my code.
//mymodel.h
class MyModel : public QAbstractTableModel
{
Q_OBJECT
public:
MyModel(QObject *parent = 0);
int rowCount(const QModelIndex &parent = QModelIndex()) const;
int columnCount(const QModelIndex &parent = QModelIndex()) const;
QVariant data(const QModelIndex &index, int role) const;
void setRecordMap(QMap<int, QList<QSqlRecord>> *map);
void setSelectedSerMsgIndex(QModelIndex *index);
private:
QMap<int, QList<QSqlRecord>> *recordMap;
QModelIndex *selectedSerendibMsgIndex;
};
//mymodel.cpp
MyModel::MyModel(QObject *parent) : QAbstractTableModel(parent)
{
}
int MyModel::rowCount(const QModelIndex &parent) const
{
if(recordMap->isEmpty())
return 0;
int row = selectedSerendibMsgIndex->row();
return recordMap->value(row).size();
}
int MyModel::columnCount(const QModelIndex &parent) const
{
if(recordMap->isEmpty())
return 0;
int row = selectedSerendibMsgIndex->row();
return recordMap->value(row).at(0).count();
}
QVariant MyModel::data(const QModelIndex &index, int role) const
{
if(recordMap->isEmpty())
return QVariant();
if (!index.isValid())
return QVariant();
int row = selectedSerendibMsgIndex->row();
if (index.row() >= recordMap->value(row).size())
return QVariant();
if (role == Qt::DisplayRole)
{
return recordMap->value(row).value(index.row()).value(index.column()); /* QVariant("hello");*/
}
else
{
return QVariant();
}
}
void MyModel::setRecordMap(QMap<int, QList<QSqlRecord>> *map)
{
recordMap = map;
}
void MyModel::setSelectedSerMsgIndex(QModelIndex *index)
{
selectedSerendibMsgIndex = index;
}
Sorry for the huge post. But the problem is, I cannot see the data from the map. I am guessing it is because there's something wrong with my implementation of the data() method. But I can't figure out what it is. Please be kind enough to help me. Thank you.

Answer 1

try changing this:
void MyModel::setRecordMap(QMap<int, QList<QSqlRecord>> *map)
{
recordMap = map;
}
to this:
void MyModel::setRecordMap(QMap<int, QList<QSqlRecord>> *map)
{
beginResetModel();
recordMap = map;
endResetModel();
}