feat(migration): add parent_id column and foreign key to branches table with checks

database/migrations/2025_05_18_074721_add_parent_id_to_branches_table.php

@@ -3,18 +3,30 @@
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Facades\DB;
 
-return new class extends Migration
+return new class extends Migration {
-{
     /**
      * Run the migrations.
      */
     public function up(): void
     {
         Schema::table('branches', function (Blueprint $table) {
-            $table->unsignedBigInteger('parent_id')->nullable()->after('name');
+            // Tambah kolom parent_id jika belum ada
-            $table->foreign('parent_id')->references('id')->on('branches')->onDelete('set null');
+            if (!Schema::hasColumn('branches', 'parent_id')) {
+                $table->unsignedBigInteger('parent_id')->nullable()->after('name');
+            }
         });
+
+        // Tambah foreign key jika belum ada
+        if (!$this->foreignKeyExists('branches', 'branches_parent_id_foreign')) {
+            Schema::table('branches', function (Blueprint $table) {
+                $table->foreign('parent_id', 'branches_parent_id_foreign')
+                    ->references('id')
+                    ->on('branches')
+                    ->onDelete('set null');
+            });
+        }
     }
 
     /**
@@ -22,9 +34,39 @@ return new class extends Migration
      */
     public function down(): void
     {
+        // Drop foreign key jika ada
+        if ($this->foreignKeyExists('branches', 'branches_parent_id_foreign')) {
+            Schema::table('branches', function (Blueprint $table) {
+                $table->dropForeign('branches_parent_id_foreign');
+            });
+        }
+
+        // Drop kolom jika ada
         Schema::table('branches', function (Blueprint $table) {
-            $table->dropForeign(['parent_id']);
+            if (Schema::hasColumn('branches', 'parent_id')) {
-            $table->dropColumn('parent_id');
+                $table->dropColumn('parent_id');
+            }
         });
     }
+
+    /**
+     * Cek apakah foreign key exists
+     */
+    private function foreignKeyExists(string $table, string $name): bool
+    {
+        $conn = Schema::getConnection();
+        $dbName = $conn->getDatabaseName();
+
+        $result = DB::select(
+            "SELECT CONSTRAINT_NAME
+             FROM information_schema.TABLE_CONSTRAINTS
+             WHERE TABLE_SCHEMA = ?
+             AND TABLE_NAME = ?
+             AND CONSTRAINT_NAME = ?
+             AND CONSTRAINT_TYPE = 'FOREIGN KEY'",
+            [$dbName, $table, $name]
+        );
+
+        return count($result) > 0;
+    }
 };