如何根据特定的唯一键(存储在数组中的唯一键)的列表打印值

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//1.检索具体id并存储在数组中

let uid = Auth.auth().currentUser?.uid
        Database.database().reference().child("users").child(uid!).child("cart").observeSingleEvent(of: .value, with: { (snapshot) in


        if let snapDict = snapshot.value as? [String:AnyObject]{

            for each in snapDict as [String:AnyObject]{

                let refID = each.value["refID"] as! String
                self.ArrproductID.append(refID) //append to array

            }
             //print(self.ArrproductID)
        }

    })
    { (error) in
        print(error.localizedDescription)
    }

//2.根据数组中存储的id从firebase中取数

    refProduct = (Database.database().reference().child("Product").queryOrderedByKey().queryEqual(toValue: ArrproductID) as! DatabaseReference)

    refProduct.observe(DataEventType.value, with:{(snapshot) in
        if snapshot.childrenCount>0{
            self.productList.removeAll()

            for Product in snapshot.children.allObjects as![DataSnapshot]{

                let productObject = Product.value as? [String: AnyObject]
                let ID = Product.key
                let ProductName = productObject?["ProductName"]
                let ProductPrice = productObject?["ProductPrice"]
                let ProductImage = productObject?["ProductImage"]



                //refer to the productmodel.swift? //2. store into model?
                let product = ProductModel( ProductId: ID as String?, ProductName: ProductName as! String? , ProductPrice: ProductPrice as! String?, ProductImage: ProductImage as! String?)


                //3. apend all product to list
                self.productList.append(product)



            }
            //reload all the data?
            self.CartItemView?.reloadData()


        }
    })

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