save discount profile is now working perfectly well

src/shared/pricing.rs

@@ -370,6 +370,40 @@ pub async fn audience_price_many(
     Ok(list.iter().map(|p| detail_for(p, &pc).priced()).collect())
 }
 
+/// Like [`audience_price_many`], but prices against an *unsaved* set of profile
+/// ids for the active audience instead of the persisted assignment. Used by the
+/// products page to preview effective prices as the admin toggles profile
+/// checkboxes, before they hit Save. For the business tab the personal layer
+/// stays the persisted one (businesses get the lower of personal/business), and
+/// only the business layer is replaced by the previewed selection.
+pub async fn audience_price_many_preview(
+    ctx: &AppContext,
+    list: &[products::Model],
+    audience: &str,
+    selected_profile_ids: Vec<i32>,
+) -> Result<Vec<PricedProduct>> {
+    let preview = load_profiles_by_ids(ctx, selected_profile_ids).await?;
+    let (personal, business, b2b) = if audience == AUDIENCE_BUSINESS {
+        (
+            load_audience(ctx, AUDIENCE_PERSONAL).await?,
+            preview,
+            Some(B2bContext {
+                manual: HashMap::new(),
+                profiles: LoadedProfiles::empty(),
+                resolutions: HashMap::new(),
+            }),
+        )
+    } else {
+        (preview, LoadedProfiles::empty(), None)
+    };
+    let pc = PricingCtx {
+        personal,
+        business,
+        b2b,
+    };
+    Ok(list.iter().map(|p| detail_for(p, &pc).priced()).collect())
+}
+
 /// Price one product for `user` (`None` = anonymous/public).
 pub async fn price_for(
     ctx: &AppContext,