Add unique constraint to address

accounts/migrations/0002_address_accounts_address_all_key.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.1.5 on 2023-01-25 00:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='address',
+            constraint=models.UniqueConstraint(fields=('first_name', 'last_name', 'street_address_1', 'street_address_2', 'city', 'state', 'postal_code'), name='accounts_address_all_key', violation_error_message='Duplicate: Address already exists.'),
+        ),
+    ]

accounts/models.py

@@ -46,6 +46,23 @@ class Address(models.Model):
         yield ('postal_code', self.postal_code),
         yield ('country_code', 'US')
 
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                name='accounts_address_all_key',
+                fields=[
+                    'first_name',
+                    'last_name',
+                    'street_address_1',
+                    'street_address_2',
+                    'city',
+                    'state',
+                    'postal_code'
+                ],
+                violation_error_message='Duplicate: Address already exists.'
+            )
+        ]
+
 
 class User(AbstractUser):
     addresses = models.ManyToManyField(