//...
    async store(req, res) {
        if(!req.body.name ||
            !req.body.city ||
            !req.body.salary ||
            !req.body.positionId) {
            res.status(400)
            res.json({
                success: false,
                message: 'Hiba! A bejövő adatok hibásak!'
            })
        }

        try {
            await EmployeeController.tryStore(req, res)
        } catch (error) {
            if (error instanceof Sequelize.ValidationError) {
                res.status(400)
            }else {
                res.status(500)
            }
            const errorMessage = error.errors[0].message
            res.json({
                success: true,
                message: 'Error! The update is failed!',
                error: errorMessage
            })
        }        
    },
    async tryStore(req, res) {
        const emp = await Employee.create(req.body)
        res.status(201)
        res.json({
            success: true,
            data: emp
        })
    },
//...