fix(core-flows): Avoid throwing if no prices found for variant when adding to cart custom price item (#14528)

* Avoid throwing prices not found error when line item is custom unit price

* Add changeset

* Avoid throwing upo variant price validation for custom priced item variants

packages/core/core-flows/src/cart/steps/get-variant-price-sets.ts

@@ -91,13 +91,15 @@ async function fetchVariantPriceSets(
 }
 
 /**
- * Validates that all variants have price sets and throws error for missing ones
+ * Validates that all variants without a custom price have price sets and throws error for missing ones
  */
 function validateVariantPriceSets(
-  variantPriceSets: VariantPriceSetData[]
+  variantPriceSets: VariantPriceSetData[],
+  variantsWithCustomPrice: string[] = []
 ): void {
+  const variantsWithCustomPriceSet = new Set(variantsWithCustomPrice)
   const notFound = variantPriceSets
-    .filter((v) => !v.price_set?.id)
+    .filter((v) => !v.price_set?.id && !variantsWithCustomPriceSet.has(v.id))
     .map((v) => v.id)
 
   if (notFound.length) {
@@ -287,7 +289,10 @@ export const getVariantPriceSetsStep = createStep(
       const variantIds = bulkData.map((item) => item.variantId)
       const variantPriceSets = await fetchVariantPriceSets(query, variantIds)
 
-      validateVariantPriceSets(variantPriceSets)
+      const variantsWithCustomPrice = bulkData
+        .filter((item) => !!item.context?.is_custom_price)
+        .map((item) => item.variantId)
+      validateVariantPriceSets(variantPriceSets, variantsWithCustomPrice)
 
       // Map variant IDs to price set IDs
       const variantToPriceSetId = new Map<string, string>()

packages/core/core-flows/src/cart/workflows/get-variants-and-items-with-prices.ts

@@ -125,6 +125,7 @@ export const getVariantsAndItemsWithPrices = createWorkflow(
               context: {
                 ...baseContext,
                 quantity: item.quantity,
+                is_custom_price: !!item.unit_price,
               },
             }
           })
@@ -180,7 +181,10 @@ export const getVariantsAndItemsWithPrices = createWorkflow(
             calculatedPriceSet = calculatedPriceSets[item_.variant_id!]
           }
 
-          if (!calculatedPriceSet && item_.variant_id) {
+          const isCustomPrice =
+            item_.is_custom_price ?? isDefined(item?.unit_price)
+
+          if (!calculatedPriceSet && item_.variant_id && !isCustomPrice) {
             priceNotFound.push(item_.variant_id)
           }
 
@@ -198,9 +202,6 @@ export const getVariantsAndItemsWithPrices = createWorkflow(
             variant.calculated_price = calculatedPriceSet
           }
 
-          const isCustomPrice =
-            item_.is_custom_price ?? isDefined(item?.unit_price)
-
           const input: PrepareLineItemDataInput = {
             item: item_,
             variant: variant,