Ошибка поиска добавления слота qt

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#include "manager.h"
#include "ui_Manager.h"
 
using std::unique_ptr;
 
Manager::Manager(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Manager)
{
    ui->setupUi(this);
    ui->stackedWidget->setCurrentIndex(0);
 
//    ui->tableWidget_Employee->setSelectionMode(QAbstractItemView::NoSelection);
//    ui->tableWidget_Employee->setFocusPolicy(Qt::NoFocus);
 
    //ui->tableWidget_Employee->setSelectionBehavior(QAbstractItemView::AdjustToContentsOnFirstShow);
 
 
    loadTableEmployee();
 
    loadAllTables();
    loadComboPost();
 
    connect(ui->pushButton_addEmployee, &QPushButton::clicked, this, &Manager::on_pushButton_AddEmployee_clicked);
    connect(ui->pushButton_backToTables, &QPushButton::clicked, this, &Manager::on_pushButton_backToTables_clicked);
    connect(ui->tableWidget_Employee, &QTableWidget::cellClicked, this, &Manager::on_tableWidget_itemClicked);
    connect(ui->pushButton_toEditEmployee, &QPushButton::clicked, this, &Manager::on_pushButton_toEditEmployee_clicked);
}
 
Manager::~Manager()
{
    delete ui;
}
 
int Manager::getCurrentPost()
{
    int id_post = Database::id_post(ui->comboBox_Post->currentText());
 
    if(id_post == -1)
    {
        qDebug() << "nINSERT INTO EmployeePost(title = " <<ui->comboBox_Post->currentText() << ")";
        id_post = Database::addPost(ui->comboBox_Post->currentText());
 
        if(id_post == -1)
        {
            qDebug() << "Errorn";
        }
        else
        {
            qDebug() << "Succes (id = "<< id_post << ")n";
            ui->comboBox_Post->addItem(ui->comboBox_Post->currentText());
        }
    }
 
    return id_post;
}
 
void Manager::loadComboPost()
{
    ui->comboBox_Post->addItems(Database::listPost());
}
 
void Manager::loadTableEmployee()
{
    ui->tableWidget_Employee->setRowCount(Database::countEmployee()); // указываем количество строк
 
    unique_ptr<QSqlQuery> query(new QSqlQuery());
    query->exec("SELECT p.surname, p.name, p.second_name, x.title, e.phone, e.salary, e.recruitment "
                "FROM Employee AS e "
                "JOIN Passport AS p "
                        "ON p.itn = e.id_passport "
                "JOIN EmployeePost AS x "
                        "ON x.id = e.id_post "
                );
    QString fullname;
    for(int row = 0; row < ui->tableWidget_Employee->rowCount(); ++row)
    {
        query->next();
        fullname = QString(query->value(0).toString() + " " + query->value(1).toString().at(0) + ". " +
                         query->value(2).toString().at(0) + ".");
        ui->tableWidget_Employee->setItem(row, 0, new QTableWidgetItem(fullname));
        for(int column = 1; column < ui->tableWidget_Employee->columnCount(); ++column)
            ui->tableWidget_Employee->setItem(row, column, new QTableWidgetItem(query->value(column+2).toString()));
    }
 
}
 
void Manager::loadTable(const int&& tableTitle, QTableView* tableView)
{
    model = new QSqlTableModel();
 
    switch(tableTitle)
    {
    case Table::Schedule:
    {
        model->setTable("Schedule");
        model->setHeaderData(0,Qt::Horizontal, "Начало");
        model->setHeaderData(1,Qt::Horizontal, "Контент");
        model->setHeaderData(2,Qt::Horizontal, "Команда");
    } break;
 
    case Table::Employee:
    {
        model->setTable("Employee");
        model->setHeaderData(0,Qt::Horizontal, "Ф.И.О.");
        model->setHeaderData(1,Qt::Horizontal, "Телефон");
        model->setHeaderData(2,Qt::Horizontal, "Должность");
        model->setHeaderData(3,Qt::Horizontal, "Зарплата");
        model->setHeaderData(4,Qt::Horizontal, "Работает с");
        model->setHeaderData(5,Qt::Horizontal, "Отпускные");
        model->setHeaderData(6,Qt::Horizontal, "Больничные");
    }break;
 
    case Table::TeamList:
    {
        model->setTable("TeamList");
        model->setHeaderData(0,Qt::Horizontal, "Команда");
        model->setHeaderData(1,Qt::Horizontal, "Работник");
    }break;
    };
 
    model->select();
    tableView->setModel(model);
    tableView->resizeColumnsToContents();
    tableView->show();
}
 
void Manager::loadAllTables()
{
    loadTable(Table::Schedule, ui->tableView_Schedule);
    loadTable(Table::TeamList, ui->tableView_TeamList);
}
 
void Manager::on_pushButton_toEditEmployee_clicked()
{
 
}
 
void Manager::on_tableWidget_itemClicked(int row, int col)
{
    //ui->tableWidget_Employee->setRangeSelected(QTableWidgetSelectionRange(row, 0, row, 4), true);
}
 
void Manager::on_listWidget_itemSelectionChanged()
{
    ui->stackedWidget_Tables->setCurrentIndex(ui->listWidget->currentRow());
}
 
void Manager::on_pushButton_toAddEmployee_clicked()
{
    ui->stackedWidget->setCurrentIndex(Form::AddEmployee);
}
 
void Manager::on_pushButton_backToTables_clicked()
{
    ui->stackedWidget->setCurrentIndex(Form::Tables);
}
 
void Manager::on_pushButton_AddEmployee_clicked()
{
    Passport passport(ui->lineEdit_Surname->text(), ui->lineEdit_Name->text(), ui->lineEdit_SecondName->text(),
                      ui->dateEdit_Birthday->date(), ui->lineEdit_itn->text().toInt());
 
    Employee employee(passport, ui->lineEdit_Phone->text(), getCurrentPost(), ui->lineEdit_Salary->text().toInt(),
                      ui->dateEdit_Recruitment->date());
 
    if(!employee.isValid())
    {
        QMessageBox::information(0,0,"Ошибка при добавлении");
        return;
    }
 
    if(Database::addEmployee(employee))
        QMessageBox::information(0,0,"Сотрудник добавлен");
    else
        QMessageBox::warning(0,0,"Ошибка! Сотрудник не добавлен");
}