How to store Values in Array/NSMutableArray From Model Class Dictionary?

Question

Here i want to store values into an Array from ModelClass response Dictionary.

Model Class Dictionary Function

func toDictionary() -> [String:Any]
    {
        var dictionary = [String:Any]()
        if inwishlist != nil{
            dictionary["Inwishlist"] = inwishlist
        }
        if image != nil{
            dictionary["image"] = image
        }
        if productId != nil{
            dictionary["product_id"] = productId
        }
        if productName != nil{
            dictionary["product_name"] = productName
        }
        if regularPrice != nil{
            dictionary["regular_price"] = regularPrice
        }
        if shortDescription != nil{
            dictionary["short_description"] = shortDescription
        }
        if specialPrice != nil{
            dictionary["special_price"] = specialPrice
        }
        if stockStatus != nil{
            dictionary["stock_status"] = stockStatus
        }
        if type != nil{
            dictionary["type"] = type
        }
        if wishlistItemId != nil{
            dictionary["wishlist_item_id"] = wishlistItemId
        }
        return dictionary
    }

Response i get from API

 "products" : [
      {
        "special_price" : "",
        "stock_status" : true,
        "product_id" : "879",
        "type" : "simple",
        "image" : "catalog\/product\/k\/8\/k834_8.jpg",
        "product_name" : "Bourgeat Stainless Steel Saucepan Lid 240mm",
        "regular_price" : "17.4900",
        "wishlist_item_id" : "0",
        "Inwishlist" : "OUT",
        "short_description" : null
      }    

    ]

But when I try This code :-

let dataS = self.resultGetProductRoot?.response.products[0].toDictionary().keys as! [String]

i get this error:-

Cast from 'Dictionary.Keys?' to unrelated type '[String]' always fails

And when I try This code :-

  let dataS = self.resultGetProductRoot?.response.products[0].toDictionary().keys
  var dat = [String]()
  dat = dataS

i got below error:-

Cannot assign value of type 'Dictionary.Keys?' to type '[String]'

denis_lor · Accepted Answer · 2019-08-07 09:09:41Z

3

Since Xcode 7.0 beta 6 in order to have the keys of your Dictionary as an array you can achieve it like this:

let productKeys = self.resultGetProductRoot?.response.products[0].toDictionary().keys
var productKeysList = Array(productKeys)

answered Aug 7, 2019 at 9:09

denis_lor

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Comments

user9335240 · Accepted Answer · 2019-08-07 09:14:17Z

Collections are very type safe in Swift, it is not like Java/Objective-C for example which are dynamic. So, in this case you would convert the array manually using loops or using functional programming.

For example (using functional programming):

let dictionaryOrEmpty = dictionary ?? [:] // Make an empty dictionary if the dictionary itself is nil
let keysCollection = dictionaryOrEmpty.keys
let strings = keysCollection.map { $0.description } // Get the "string representation" of each of the keys

You can make it one-liner using the following:

let strings = (dictionary ?? [:]).keys.map { $0.description }

Performance gain (both memory and time) could be done using the lazy collections also (if all what you need is iterate this as a sequence)

let strings = (dictionary ?? [:]).keys.lazy.map { $0.description }

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