Price model

counter/admin.py

@@ -24,6 +24,7 @@ from counter.models import (
     Eticket,
     InvoiceCall,
     Permanency,
+    Price,
     Product,
     ProductType,
     Refilling,
@@ -32,19 +33,24 @@ from counter.models import (
 )
 
 
+class PriceInline(admin.TabularInline):
+    model = Price
+    autocomplete_fields = ("groups",)
+
+
 @admin.register(Product)
 class ProductAdmin(SearchModelAdmin):
     list_display = (
         "name",
         "code",
         "product_type",
-        "selling_price",
         "archived",
         "created_at",
         "updated_at",
     )
     list_select_related = ("product_type",)
     search_fields = ("name", "code")
+    inlines = [PriceInline]
 
 
 @admin.register(ReturnableProduct)

counter/api.py

@@ -101,13 +101,9 @@ class ProductController(ControllerBase):
         """Get the detailed information about the products."""
         return filters.filter(
             Product.objects.select_related("club")
-            .prefetch_related("buying_groups")
+            .prefetch_related("prices", "prices__groups")
             .select_related("product_type")
-            .order_by(
+            .order_by(F("product_type__order").asc(nulls_last=True), "name")
-                F("product_type__order").asc(nulls_last=True),
-                "product_type",
-                "name",
-            )
         )
 
 

counter/migrations/0038_price.py

@@ -0,0 +1,108 @@
+# Generated by Django 5.2.11 on 2026-02-18 13:30
+
+import django.db.models.deletion
+from django.db import migrations, models
+from django.db.migrations.state import StateApps
+
+import counter.fields
+
+
+def migrate_prices(apps: StateApps, schema_editor):
+    Product = apps.get_model("counter", "Product")
+    Price = apps.get_model("counter", "Price")
+    prices = [
+        Price(
+            amount=p.selling_price,
+            product=p,
+            created_at=p.created_at,
+            updated_at=p.updated_at,
+        )
+        for p in Product.objects.all()
+    ]
+    Price.objects.bulk_create(prices)
+    groups = [
+        Price.groups.through(price=price, group=group)
+        for price in Price.objects.select_related("product").prefetch_related(
+            "product__buying_groups"
+        )
+        for group in price.product.buying_groups.all()
+    ]
+    Price.groups.through.objects.bulk_create(groups)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("core", "0048_alter_user_options"),
+        ("counter", "0037_productformula"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Price",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "amount",
+                    counter.fields.CurrencyField(
+                        decimal_places=2, max_digits=12, verbose_name="amount"
+                    ),
+                ),
+                (
+                    "is_always_shown",
+                    models.BooleanField(
+                        default=False,
+                        help_text=(
+                            "If this option is enabled, "
+                            "people will see this price and be able to pay it, "
+                            "even if another cheaper price exists. "
+                            "Else it will visible only if it is the cheapest available price."
+                        ),
+                        verbose_name="always show",
+                    ),
+                ),
+                (
+                    "label",
+                    models.CharField(
+                        default="",
+                        help_text="A short label for easier differentiation if a user can see multiple prices.",
+                        max_length=32,
+                        verbose_name="label",
+                        blank=True,
+                    ),
+                ),
+                (
+                    "created_at",
+                    models.DateTimeField(auto_now_add=True, verbose_name="created at"),
+                ),
+                (
+                    "updated_at",
+                    models.DateTimeField(auto_now=True, verbose_name="updated at"),
+                ),
+                (
+                    "groups",
+                    models.ManyToManyField(
+                        related_name="prices", to="core.group", verbose_name="groups"
+                    ),
+                ),
+                (
+                    "product",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="prices",
+                        to="counter.product",
+                        verbose_name="product",
+                    ),
+                ),
+            ],
+            options={"verbose_name": "price"},
+        ),
+        migrations.RunPython(migrate_prices, reverse_code=migrations.RunPython.noop),
+    ]

counter/models.py

@@ -456,6 +456,78 @@ class Product(models.Model):
         return self.selling_price - self.purchase_price
 
 
+class PriceQuerySet(models.QuerySet):
+    def for_user(self, user: User) -> Self:
+        age = user.age
+        if user.is_banned_alcohol:
+            age = min(age, 17)
+        return self.filter(
+            Q(is_always_shown=True, groups__in=user.all_groups)
+            | Q(
+                id=Subquery(
+                    Price.objects.filter(
+                        product_id=OuterRef("product_id"), groups__in=user.all_groups
+                    )
+                    .order_by("amount")
+                    .values("id")[:1]
+                )
+            ),
+            product__archived=False,
+            product__limit_age__lte=age,
+        )
+
+
+class Price(models.Model):
+    amount = CurrencyField(_("amount"))
+    product = models.ForeignKey(
+        Product,
+        verbose_name=_("product"),
+        related_name="prices",
+        on_delete=models.CASCADE,
+    )
+    groups = models.ManyToManyField(
+        Group, verbose_name=_("groups"), related_name="prices"
+    )
+    is_always_shown = models.BooleanField(
+        _("always show"),
+        help_text=_(
+            "If this option is enabled, "
+            "people will see this price and be able to pay it, "
+            "even if another cheaper price exists. "
+            "Else it will visible only if it is the cheapest available price."
+        ),
+        default=False,
+    )
+    label = models.CharField(
+        _("label"),
+        help_text=_(
+            "A short label for easier differentiation "
+            "if a user can see multiple prices."
+        ),
+        max_length=32,
+        default="",
+        blank=True,
+    )
+    created_at = models.DateTimeField(_("created at"), auto_now_add=True)
+    updated_at = models.DateTimeField(_("updated at"), auto_now=True)
+
+    objects = PriceQuerySet.as_manager()
+
+    class Meta:
+        verbose_name = _("price")
+
+    def __str__(self):
+        if not self.label:
+            return f"{self.product.name} ({self.amount}€)"
+        return f"{self.product.name} {self.label} ({self.amount}€)"
+
+    @property
+    def full_label(self):
+        if not self.label:
+            return self.product.name
+        return f"{self.product.name} \u2013 {self.label}"
+
+
 class ProductFormula(models.Model):
     products = models.ManyToManyField(
         Product,
@@ -1001,7 +1073,9 @@ class Selling(models.Model):
         event = self.product.eticket.event_title or _("Unknown event")
         subject = _("Eticket bought for the event %(event)s") % {"event": event}
         message_html = _(
-            "You bought an eticket for the event %(event)s.\nYou can download it directly from this link %(eticket)s.\nYou can also retrieve all your e-tickets on your account page %(url)s."
+            "You bought an eticket for the event %(event)s.\n"
+            "You can download it directly from this link %(eticket)s.\n"
+            "You can also retrieve all your e-tickets on your account page %(url)s."
         ) % {
             "event": event,
             "url": (

counter/schemas.py

@@ -6,8 +6,8 @@ from ninja import FilterLookup, FilterSchema, ModelSchema, Schema
 from pydantic import model_validator
 
 from club.schemas import SimpleClubSchema
-from core.schemas import GroupSchema, NonEmptyStr, SimpleUserSchema
+from core.schemas import NonEmptyStr, SimpleUserSchema
-from counter.models import Counter, Product, ProductType
+from counter.models import Counter, Price, Product, ProductType
 
 
 class CounterSchema(ModelSchema):
@@ -66,6 +66,12 @@ class SimpleProductSchema(ModelSchema):
         fields = ["id", "name", "code"]
 
 
+class ProductPriceSchema(ModelSchema):
+    class Meta:
+        model = Price
+        fields = ["amount", "groups"]
+
+
 class ProductSchema(ModelSchema):
     class Meta:
         model = Product
@@ -75,13 +81,12 @@ class ProductSchema(ModelSchema):
             "code",
             "description",
             "purchase_price",
-            "selling_price",
             "icon",
             "limit_age",
             "archived",
         ]
 
-    buying_groups: list[GroupSchema]
+    prices: list[ProductPriceSchema]
     club: SimpleClubSchema
     product_type: SimpleProductTypeSchema | None
     url: str