undefined symbol while loading plugin

[qlands]

Hi,

I have a plugin library (like the QT plug-and-paint example) that contains a series of QWidgets to enter data.

The interface of the plugin has a pure virtual fuction called QWidget* impMainModules::loadScreen(QString pluginName) that returns a widget bases on a plugin name.

All worked fine until I wanted to create a QtableModel to use in some of the widgets:

class fieldInRowModel :  public QAbstractTableModel
{
    Q_OBJECT
public:
    fieldInRowModel(QObject *parent=0);
    ~fieldInRowModel();
 
    int rowCount(const QModelIndex & parent = QModelIndex()) const;
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
    void setDatabase (QSqlDatabase db);
private:
    QSqlDatabase database;
 
};

class fieldInRowModel :  public QAbstractTableModel
{
    Q_OBJECT
public:
    fieldInRowModel(QObject *parent=0);
    ~fieldInRowModel();

    int rowCount(const QModelIndex & parent = QModelIndex()) const;
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
    void setDatabase (QSqlDatabase db);
private:
    QSqlDatabase database;

};

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Implemented as:

fieldInRowModel::fieldInRowModel(QObject *parent)
    :QAbstractTableModel(parent)
{
 
}
 
fieldInRowModel::~fieldInRowModel()
{
 
}
 
int fieldInRowModel::rowCount(const QModelIndex &) const
{
    return 0; //Test value
}
 
int fieldInRowModel::columnCount(const QModelIndex &) const
{
    return 0; //Test value
}
QVariant fieldInRowModel::data(const QModelIndex &/*index*/, int /*role*/) const
{
    return QVariant(); //Test value
}
void fieldInRowModel::setDatabase (QSqlDatabase db)
{
    database = db;
}

fieldInRowModel::fieldInRowModel(QObject *parent)
    :QAbstractTableModel(parent)
{
    
}

fieldInRowModel::~fieldInRowModel()
{

}

int fieldInRowModel::rowCount(const QModelIndex &) const
{
    return 0; //Test value
}

int fieldInRowModel::columnCount(const QModelIndex &) const
{
    return 0; //Test value
}
QVariant fieldInRowModel::data(const QModelIndex &/*index*/, int /*role*/) const
{
    return QVariant(); //Test value
}
void fieldInRowModel::setDatabase (QSqlDatabase db)
{
    database = db;
}

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fieldInRowModel is in a separate file called moduleclasses.h and cpp that are part of the plugin library project .

Now, with the inclusion of this class in the plugin library, I get the following error when the main application intents to load the plugin.

undefined symbol: _ZTV15fieldInRowModel

undefined symbol: _ZTV15fieldInRowModel

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fieldInRowModel is internal for the library thus the main application should not know that it exists.

Any idea how to fix it?

Thanks a lot!
Carlos.