class Regione extends Model
{
    protected $table = 'regioni';

    public function province()
    {
        return $this->hasMany('App\Provincia');
    }
}

class Provincia extends Model
{
    protected $table = 'province';

    public function regione()
    {
        return $this->belongsTo('App\Regione');
    }

    public function dipendenti()
    {
        return $this->hasMany('App\Dipendente');
    }
}

class Dipendente extends Model
{
    protected $table = 'dipendenti';

    public function province()
    {
        return $this->belongsToMany('App\Provincia');
    }
}