Array of strings is not saved to Realm object using ObjectMapper

Question

This is how I declared imageurls inside My Object :

var imageURLs = List<String>()

and parsing:

func mapping(map: Map) {
    imageURLs <- map["image_urls"]
}

and this is what I am trying to parse:

{ "image_urls": ["a"] }

At the end above property is empty. Why?

Using Realm 3.3 so array of primitives should work.

Answer 1

In case you are working with both Realm an ObjectMapper, there is a pretty cool option for you, by using ObjectMapper+Realm , you would be able to map arrays directly to realm lists, as follows:

func mapping(map: Map) {
    imageURLs <- (map["image_urls"], ListTransform<String>())
}

Note that by default the object mapper is unable to map arrays as realm lists, which is possible by using the above library.

Answer 2

You can create a variable in the function and map items to an array:

func mapping(map: Map) {
   var pathes = [String]()
   pathes <- map["image_urls"]
   self.imageUrls.add(pathes)
}

Or you could use the extension, which called ObjectMapper+Realm , as written above.

Answer 3

You can map array of String using ObjectMapper like below, this works fine:

import ObjectMapper
import RealmSwift
import ObjectMapper_Realm

public class Items: Object, Mappable {

var images = List<ListImages>()
@objc dynamic var id = 0

required convenience public init?(map : Map){
   self.init()
}

public override class func primaryKey() -> String? {
   return "id"
}

public func mapping(map: Map) {
var images: [String]? = nil
images <- map["image"]

images?.forEach { image in
    let value = ListImages()
    value.value = image
    self.images.append(value)
  }
}
}


class ListImages:Object{
    @objc dynamic var value: String = ""
}

Answer 4

I have solved the problem using RealmTypeCastTransform()

In your code just add this

func mapping(map: Map) {
    imageURLs <- (map["image_urls"], RealmTypeCastTransform())
}

Now import ObjectMapperAdditions in the beginning of your file