Null safety in rebate bills (#109)

Author: mittal-ishaan

home/migrations/0005_alter_studentbills_email.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.0.8 on 2024-12-28 14:40
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('home', '0004_alter_student_room_no'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='studentbills',
+            name='email',
+            field=models.ForeignKey(default='', null=True, on_delete=django.db.models.deletion.CASCADE, to='home.student'),
+        ),
+    ]

home/models/bills.py

@@ -11,7 +11,7 @@ class StudentBills(models.Model):
     Storing the Rebate Bills of the Students for the Semesters
     """
 
-    email = models.ForeignKey(Student, on_delete=models.SET_NULL, default="", null=True)
+    email = models.ForeignKey(Student, on_delete=models.CASCADE, default="", null=True)
     semester = models.ForeignKey(
         Semester,
         verbose_name=_("Semester"),
@@ -75,7 +75,7 @@ class StudentBills(models.Model):
     )
 
     def __str__(self):
-        return str(self.email.email)
+        return str(self.email.email if self.email else "")
 
     class Meta:
         verbose_name = "Rebate Bill"