Fixed migration error by setting ForeignKey null parameter to True

homepage/migrations/0003_alter_widgetuser_department.py

+# Generated by Django 3.2.12 on 2022-04-04 14:39
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('homepage', '0002_auto_20220404_1025'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='widgetuser',
+            name='department',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='users', to='homepage.department'),
+        ),
+    ]

homepage/models.py

@@ -11,4 +11,4 @@ class WidgetUser(models.Model):
     last_name = models.CharField(max_length=50)
     id_num = models.CharField(max_length=7, default="")
     email = models.EmailField(default="")
-    department = models.ForeignKey(Department, on_delete=models.CASCADE, related_name="users", default="")
+    department = models.ForeignKey(Department, on_delete=models.CASCADE, null=True, related_name="users")