'datetime', 'updated_at' => 'datetime', ]; public function detail_alternatif() { return $this->hasMany(DetailAlternatif::class, 'id_alternatif', 'id_alternatif'); } public function riwayat_analisa() { return $this->hasMany(RiwayatAnalisa::class, 'id_alternatif', 'id_alternatif'); } public function users() { return $this->belongsTo(User::class, 'id_users', 'id_users'); } }