feat: Add transaction code generation for orders and update receipt templates

tienda/migrations/0003_order_transaction_code.py

@@ -0,0 +1,41 @@
+# Generated by Django 6.0.1 on 2026-04-09
+
+from django.db import migrations, models
+from django.utils.crypto import get_random_string
+
+
+TRANSACTION_CODE_PREFIX = "comal-"
+TRANSACTION_CODE_LENGTH = 32
+TRANSACTION_CODE_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
+
+def populate_transaction_codes(apps, schema_editor):
+    Order = apps.get_model("tienda", "Order")
+
+    for order in Order.objects.filter(transaction_code__isnull=True):
+        while True:
+            code = f"{TRANSACTION_CODE_PREFIX}{get_random_string(TRANSACTION_CODE_LENGTH, TRANSACTION_CODE_ALPHABET)}"
+            if not Order.objects.filter(transaction_code=code).exists():
+                order.transaction_code = code
+                order.save(update_fields=["transaction_code"])
+                break
+
+
+def noop_reverse(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("tienda", "0002_verificationcode_code_mode_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="order",
+            name="transaction_code",
+            field=models.CharField(blank=True, db_index=True, max_length=38, null=True, unique=True),
+        ),
+        migrations.RunPython(populate_transaction_codes, noop_reverse),
+    ]