将数组数据模型转换为字典（Swift）

Question

Data Model

class DataCart {
   var icon: UIImage?
   var cartId: String
   var price: Int
   var productName: String
   var quantity: Int


init(icon: UIImage?, cartId: String, price: Int, productName: String, quantity: Int){
    self.icon = icon
    self.cartId = cartId
    self.price = price
    self.productName = productName
    self.quantity = quantity

  }
}

Dictionary

var cart = [DataCart]()

"products": [[
    "productName": "Photobook", //"dataCart.productName"
    "quantity": 2,   //"dataCart.quantity"
    "price": "5000.00",  //"dataCart.price"
    "pages": 40
    ],[
    "productName": "Photobook2",
    "quantity": 5,
    "price": "7000.00",
    "pages": 30
    ]]

for dataCart in cart {
........
}

I've array from data model that i'd like to show it as dictionary, and i got confused to change it. How to convert cart's array (DataCart) to dictionary?

Answer 1

It's good practice to make conversion at class level.

So in future if you have more keys, you just need to change at class level only instead of changing in all the places where you have used the same.

Add one calculated property dictionayDataCart in class as below. Also add one method " convertDataCartArrayToProductsDictionary: " which will convert your array of objects to dictionary.

 class DataCart {
        var icon: UIImage?
        var cartId: String
        var price: Int
        var productName: String
        var quantity: Int


        init(icon: UIImage?, cartId: String, price: Int, productName: String, quantity: Int){
            self.icon = icon
            self.cartId = cartId
            self.price = price
            self.productName = productName
            self.quantity = quantity

        }

        var dictionaryDataCart : [String : AnyObject] {

            var objDict : [String : AnyObject]!

            if let icon = self.icon {
                objDict["icon"] = icon;
            }

            objDict["cartId"] = self.cartId;
            objDict["price"] = price;
            objDict["productName"] = productName;
            objDict["quantity"] = quantity;

            return objDict;
        }

        class func convertDataCartArrayToProductsDictionary(arrayDataCart : [DataCart]) -> Dictionary<String,AnyObject> {
            var arrayDataCartDictionaries : Array<Dictionary<String,AnyObject>> = Array()
            for objDataCart in arrayDataCart {
                arrayDataCartDictionaries.append(objDataCart.dictionary);
            }
            return ["products" : arrayDataCartDictionaries];
        }

        }

Use method as below.

let arrayDataCarts : [DataCart] = //value of your array
//pass it to class function and you will get your result

let productsDict = let productsDict = DataCart.convertDataCartArrayToProductsDictionary(arrayDataCarts);

Answer 2

    var allDictionaries : [[String : AnyObject]]//array of all dictionaries.

    func convertArrayToDictionaries([DataCart]) {
       for data in DataCart {
          let  dictionary = [
             "icon" : data.icon,
             "cartId" : data.cartId,
             "price" : data.price,
             "productName" : data.productName,
             "quantity" : data.quantity
          ]
          allDictionaries.append(dictionary)
       }
 }