I have seen a lot of tutorials / explanations that discuss similar problems,
but I cannot figure out, how to apply it to this situation.

I am a Qt/C++ novice and trying to build simple GUI application that connects to an
SQLite database. I have UI form, that was built using Qt Creator designer.

UI form contains QTableView widget that is connected to my table - all seems to work fine.

I also have a pushbutton, that should - eventually - add a row to the table.
I have read, that I should not run “INSERT” query, but use methods exposed by QSqlTableModel instead.
Unfortunately I cannot access my TableView data model from slot.

Here is my code:

1) mainwindow.h

```
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDebug>
#include <QtSql>
#include <QFileInfo>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:

    void on_pushButtonChange_clicked();

    void on_pushButtonAdd_clicked();

private:
    Ui::MainWindow *ui;
    QSqlDatabase db;

};

#endif // MAINWINDOW_H

```

2) main.cpp

```
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MainWindow w;
    w.show();

    return a.exec();

}

```

3) mainwindow.cpp

```
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QString dbType = "QSQLITE";
    QString dbName = “my.db";
    QString dbTable = “myTable”;

    db = QSqlDatabase::addDatabase(dbType);
    db.setDatabaseName(dbName);
    db.open();

    QSqlTableModel *model = new QSqlTableModel(this, db);
    model->setTable(dbTable);
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model->select();

    ui->myTableView->setModel(model);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButtonAdd_clicked()
{

    //This is just to show, that I want to access QSqlTableModel from here:
    QSqlTableModel model = ui->myTableView->model();

}

```

When I run debug I am getting following error message:

error: no viable conversion from 'QAbstractItemModel \*' to 'QSqlTableModel'
 QSqlTableModel model = ui->myTableView->model();

I understand the problem - I know that I could cast QAbstractItemModel to SQLTableModel,
but this seems to be rather a workaround than the proper solution.

Could you please advise, how/where should I declare/define/instantiate my objects,
so that I get access to QSqlTableModel feeding data to my TableView from mentioned Slot?