fix

tutorial/migrations/0003_alter_tutorial_code.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.3 on 2025-06-15 06:52
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tutorial', '0002_tutorial_code_tutorial_type'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='tutorial',
+            name='code',
+            field=models.TextField(blank=True, null=True),
+        ),
+    ]

tutorial/models.py

@@ -9,7 +9,7 @@ class Tutorial(models.Model):
     
     title = models.CharField(max_length=128)
     content = models.TextField()
-    code = models.TextField(default="")
+    code = models.TextField(null=True, blank=True)
     type = models.CharField(max_length=10, choices=TYPE_CHOICES, default='python')
     created_by = models.ForeignKey(User, on_delete=models.CASCADE)
     created_at = models.DateTimeField(auto_now_add=True)