hasMany(Rule::class, 'penyakitId'); } public function diagnosa() { return $this->hasMany(Diagnosa::class, 'penyakitId'); } public function informasi() { return $this->hasMany(Informasi::class, 'penyakitId', 'penyakitId'); } public function generateId() { $maxId = DB::table('penyakits')->max(DB::raw('CAST(SUBSTRING(penyakitId, 6) AS UNSIGNED)')); $maxId = $maxId ?: 0; $newId = $maxId + 1; $formattedId = sprintf("%02d", $newId); return 'PKID-' . $formattedId; } }