database/migrations/2024_04_17_085132_add_foreign_key_to_students.php

@@ -12,7 +12,7 @@ return new class extends Migration
     public function up(): void
     {
         Schema::table('students', function (Blueprint $table) {
-            $table->foreignId('grade_id')->constrained('grades');
+            $table->foreignId('grade_id')->constrained('grades')->onDelete('cascade');
         });
     }