now products have different options, like different parameters

src/views/shop.rs

@@ -2,23 +2,28 @@
 
 use serde_json::{json, Value};
 
-use crate::models::_entities::{categories, products};
+use crate::models::_entities::{categories, product_variants, products};
 use crate::shared::money::format_price;
 use crate::shared::pricing::PricedProduct;
 
 /// Card/list shape for a product: model fields plus the viewer's resolved price
-/// (from [`crate::shared::pricing`]), its optional primary image and category.
-/// `on_sale` means "render the price as reduced" — driven by the resolved price,
-/// so it covers both public sales and business deals; `is_business` flags the
-/// latter.
+/// for its representative (first) variant, the variant count (so the template can
+/// render "from {price}" for multi-variant products), its optional primary image
+/// and category. `on_sale` means "render the price as reduced" — driven by the
+/// resolved price, so it covers both public sales and business deals;
+/// `is_business` flags the latter. `representative` is the variant whose price is
+/// shown and whose stock/sku the card exposes.
 pub fn product_card(
     product: &products::Model,
+    representative: &product_variants::Model,
     priced: &PricedProduct,
+    variant_count: usize,
     image: Option<String>,
     category_name: Option<String>,
 ) -> Value {
     json!({
         "id": product.id,
+        "variant_id": representative.id,
         "name": product.name,
         "slug": product.slug,
         "description": product.description,
@@ -27,26 +32,41 @@ pub fn product_card(
         "is_business": priced.is_business,
         "regular_price": format_price(priced.regular_cents),
         "currency": product.currency,
-        "sku": product.sku,
-        "stock": product.stock,
+        "sku": representative.sku,
+        "stock": representative.stock,
+        "variant_count": variant_count,
+        "has_options": variant_count > 1,
         "published": product.published,
         "image": image,
         "category_name": category_name,
     })
 }
 
+/// One priced variant row for the product detail page's option picker.
+pub fn variant_option(variant: &product_variants::Model, priced: &PricedProduct) -> Value {
+    json!({
+        "id": variant.id,
+        "label": variant.label,
+        "sku": variant.sku,
+        "stock": variant.stock,
+        "in_stock": variant.stock > 0,
+        "price": format_price(priced.price_cents),
+        "on_sale": priced.is_reduced(),
+        "regular_price": format_price(priced.regular_cents),
+        "is_business": priced.is_business,
+    })
+}
+
 /// Shape used to pre-fill the admin product form (exposes `category_id` rather
-/// than a resolved name, and the current primary image).
+/// than a resolved name, and the current primary image). Variants are supplied
+/// separately by the controller.
 pub fn product_form(product: &products::Model, image: Option<String>) -> Value {
     json!({
         "id": product.id,
         "name": product.name,
         "slug": product.slug,
         "description": product.description,
-        "price": format_price(product.price_cents),
         "currency": product.currency,
-        "sku": product.sku,
-        "stock": product.stock,
         "published": product.published,
         "category_id": product.category_id,
         "image": image,