feat: generic returnable products

2025-07-10 03:49:24 +00:00 · 2025-03-06 16:52:34 +01:00
parent 7515e739b6
commit e7bb08448c
9 changed files with 597 additions and 310 deletions
--- a/counter/migrations/0030_returnableproduct_returnableproductbalance_and_more.py
+++ b/counter/migrations/0030_returnableproduct_returnableproductbalance_and_more.py
@ -0,0 +1,126 @@
+# Generated by Django 4.2.17 on 2025-03-05 14:03
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+from django.db.migrations.state import StateApps
+
+
+def migrate_cons_balances(apps: StateApps, schema_editor):
+    ReturnableProduct = apps.get_model("counter", "ReturnableProduct")
+    Product = apps.get_model("counter", "Product")
+
+    cons = Product.objects.filter(pk=settings.SITH_ECOCUP_CONS).first()
+    dcons = Product.objects.filter(pk=settings.SITH_ECOCUP_DECO).first()
+    if not cons or not dcons:
+        return
+    returnable = ReturnableProduct.objects.create(
+        product=cons, returned_product=dcons, max_return=settings.SITH_ECOCUP_LIMIT
+    )
+    returnable.update_balances()
+
+
+class Migration(migrations.Migration):
+    dependencies = [("counter", "0029_alter_selling_label")]
+
+    operations = [
+        migrations.CreateModel(
+            name="ReturnableProduct",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "max_return",
+                    models.PositiveSmallIntegerField(
+                        default=0,
+                        help_text=(
+                            "The maximum number of items a customer can return "
+                            "without having actually bought them."
+                        ),
+                        verbose_name="maximum returns",
+                    ),
+                ),
+                (
+                    "product",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="cons",
+                        to="counter.product",
+                        verbose_name="returnable product",
+                    ),
+                ),
+                (
+                    "returned_product",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="dcons",
+                        to="counter.product",
+                        verbose_name="returned product",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "returnable product",
+                "verbose_name_plural": "returnable products",
+            },
+        ),
+        migrations.AddConstraint(
+            model_name="returnableproduct",
+            constraint=models.CheckConstraint(
+                check=models.Q(
+                    ("product", models.F("returned_product")), _negated=True
+                ),
+                name="returnableproduct_product_different_from_returned",
+                violation_error_message="The returnable product cannot be the same as the returned one",
+            ),
+        ),
+        migrations.CreateModel(
+            name="ReturnableProductBalance",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("balance", models.SmallIntegerField(blank=True, default=0)),
+                (
+                    "customer",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="return_balances",
+                        to="counter.customer",
+                    ),
+                ),
+                (
+                    "returnable",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="balances",
+                        to="counter.returnableproduct",
+                    ),
+                ),
+            ],
+        ),
+        migrations.AddConstraint(
+            model_name="returnableproductbalance",
+            constraint=models.UniqueConstraint(
+                fields=("customer", "returnable"),
+                name="returnable_product_unique_type_per_customer",
+            ),
+        ),
+        migrations.RunPython(
+            migrate_cons_balances, reverse_code=migrations.RunPython.noop, elidable=True
+        ),
+        migrations.RemoveField(model_name="customer", name="recorded_products"),
+    ]