'datetime', 'updated_at' => 'datetime', ]; public function users() { return $this->belongsTo(User::class, 'id_users', 'id_users'); } public function history() { return $this->hasMany(History::class, 'id_buku', 'id_buku'); } public function detailKategoriBuku() { return $this->hasMany(DetailKategoriBuku::class, 'id_buku', 'id_buku'); } public function detailContributorBuku() { return $this->hasMany(DetailContributorsBuku::class, 'id_buku', 'id_buku'); } }