Fixing QR

main.go

@@ -68,12 +68,8 @@ func CartridgePage(w http.ResponseWriter, r *http.Request){
 	if err != nil {
 		fmt.Println("Error during opening DB")
 	} else {
-		var cartridges []Cartridges
-		db.Find(&cartridges)
-		for _, v := range cartridges{
-			v.Quantity = 0
-		}
-		db.Save(&cartridges)
+		var Cartridge Cartridges
+		db.Model(&cartridge{}).Update("Quantity", 0)
 		var names []string
 		for _, v := range cartridges{
 			name := v.Name + ": " + string(v.Quantity)