now products have different options, like different parameters

src/models/orders.rs

@@ -3,7 +3,7 @@ use sea_orm::entity::prelude::*;
 use sea_orm::{Set, TransactionTrait};
 use uuid::Uuid;
 
-use crate::models::_entities::{order_items, products, shipping_methods};
+use crate::models::_entities::{order_items, product_variants, products, shipping_methods};
 use crate::models::users;
 use crate::shared::pricing;
 pub use crate::models::_entities::orders::{ActiveModel, Column, Entity, Model};
@@ -40,10 +40,10 @@ fn generate_order_number() -> String {
     format!("ORD-{suffix}")
 }
 
-/// Atomically place an order for the given `(product_id, quantity)` lines:
-/// snapshot each product's price/name, decrement stock (re-checking inside the
-/// transaction so an item can't oversell between cart and pay), then write the
-/// order and its line items. Returns the persisted order.
+/// Atomically place an order for the given `(variant_id, quantity)` lines:
+/// snapshot each variant's price/name/label, decrement its stock (re-checking
+/// inside the transaction so an item can't oversell between cart and pay), then
+/// write the order and its line items. Returns the persisted order.
 pub async fn place(
     ctx: &AppContext,
     items: &[(i32, i32)],
@@ -55,13 +55,17 @@ pub async fn place(
     let mut subtotal: i64 = 0;
     let mut currency = "EUR".to_string();
     let mut snapshots = Vec::new();
-    for (product_id, qty) in items {
-        let product = products::Entity::find_by_id(*product_id)
+    for (variant_id, qty) in items {
+        let variant = product_variants::Entity::find_by_id(*variant_id)
+            .one(&txn)
+            .await?
+            .ok_or_else(|| Error::BadRequest("an item is no longer available".to_string()))?;
+        let product = products::Entity::find_by_id(variant.product_id)
             .filter(products::Column::Published.eq(true))
             .one(&txn)
             .await?
             .ok_or_else(|| Error::BadRequest("a product is no longer available".to_string()))?;
-        if product.stock < *qty {
+        if variant.stock < *qty {
             return Err(Error::BadRequest(format!(
                 "not enough stock for {}",
                 product.name
@@ -71,14 +75,14 @@ pub async fn place(
         // Snapshot the price the buyer actually pays — public sale or, for a
         // business account, their negotiated/lowest price (same resolver the
         // cart and storefront use).
-        let unit_price_cents = pricing::price_for(ctx, &product, user).await?.price_cents;
+        let unit_price_cents = pricing::price_variant(ctx, &variant, user).await?.price_cents;
         subtotal += unit_price_cents * i64::from(*qty);
 
-        let mut active = product.clone().into_active_model();
-        active.stock = Set(product.stock - *qty);
+        let mut active = variant.clone().into_active_model();
+        active.stock = Set(variant.stock - *qty);
         active.update(&txn).await?;
 
-        snapshots.push((product.id, product.name, unit_price_cents, *qty));
+        snapshots.push((product.id, variant.id, product.name, variant.label, unit_price_cents, *qty));
     }
 
     let order = ActiveModel {
@@ -111,11 +115,13 @@ pub async fn place(
     .insert(&txn)
     .await?;
 
-    for (product_id, name, unit_price_cents, qty) in snapshots {
+    for (product_id, variant_id, name, variant_label, unit_price_cents, qty) in snapshots {
         order_items::ActiveModel {
             order_id: Set(order.id),
             product_id: Set(Some(product_id)),
+            variant_id: Set(Some(variant_id)),
             product_name: Set(name),
+            variant_label: Set(variant_label),
             unit_price_cents: Set(unit_price_cents),
             quantity: Set(qty),
             ..Default::default()