changes fixed in the catalogue

repositories/productPublishRepository.go

@@ -30,13 +30,20 @@ import (
 // Idempotent: publishing an already-published product re-prices it and leaves
 // the original `publishedat` alone, so "when did this go live" survives a
 // second click.
-func (r *productRepository) PublishProduct(tenantID, productID int, price float64) (int, error) {
+func (r *productRepository) PublishProduct(tenantID, productID int, price, taxPercent float64) (int, error) {
 	if tenantID <= 0 || productID <= 0 {
 		return 0, fmt.Errorf("tenantid and productid are required")
 	}
 	if price <= 0 {
 		return 0, fmt.Errorf("set a price before publishing — a product with no price cannot be sold at a till")
 	}
+	// Zero is a legitimate rate — plenty of staples are zero-rated — so it
+	// cannot double as "not specified". Negative is refused rather than stored:
+	// three products already carry taxpercent -1, which yields negative tax
+	// under either convention.
+	if taxPercent < 0 {
+		return 0, fmt.Errorf("tax percentage cannot be negative")
+	}
 
 	var affected int
 	err := r.db.Transaction(func(tx *gorm.DB) error {
@@ -93,9 +100,9 @@ func (r *productRepository) PublishProduct(tenantID, productID int, price float6
 		// The master price follows, so an outlet that has no row of its own
 		// still reads the right figure through the COALESCE fallback in
 		// GetProducts.
-		return tx.Exec(`UPDATE products SET retailprice = ?, updated = NOW()
+		return tx.Exec(`UPDATE products SET retailprice = ?, taxpercent = ?, updated = NOW()
 		                WHERE productid = ? AND tenantid = ?`,
-			price, productID, tenantID).Error
+			price, taxPercent, productID, tenantID).Error
 	})
 
 	return affected, err