Enhance adventure management: add error handling for category fetch, implement unique email constraint in user model, and update adventure save logic to ensure category assignment

backend/server/users/migrations/0003_alter_customuser_email.py

@@ -0,0 +1,27 @@
+# Generated by Django 5.0.8 on 2024-11-18 14:51
+
+from django.db import migrations, models
+
+def check_duplicate_email(apps, schema_editor):
+    # sets an email to null if there are duplicates
+    CustomUser = apps.get_model('users', 'CustomUser')
+    duplicates = CustomUser.objects.values('email').annotate(email_count=models.Count('email')).filter(email_count__gt=1)
+    for duplicate in duplicates:
+        CustomUser.objects.filter(email=duplicate['email']).update(email=None)
+        print(f"Duplicate email: {duplicate['email']}")
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0002_customuser_public_profile'),
+    ]
+
+    operations = [
+        migrations.RunPython(check_duplicate_email),
+        migrations.AlterField(
+            model_name='customuser',
+            name='email',
+            field=models.EmailField(max_length=254, unique=True),
+        ),
+    ]