So I have the following JSON, which I am using together with ObjectMapper and Realm.
{
  \"result\": [
    {
      \"id\": 20,
      \"types\": [
        \"now\"         
        Because Realm cannot detect assigning List properties since List property is not Objective-C type. So List properties should be declared as let, and should not be nil. You should use append/remove.../insert...method to modifying theList`.
So your code
typez <- map["types"]
doesn't work, since you assign values to the typez property directly.
The workaround is like the following:
func mapping(map: Map) {
    ...
    var typez: [String]? = nil
    typez <- map["types"]
    typez?.forEach { t in
        let obj = getType()
        obj.text = t
        self.typez.append(obj)
    }
    ...
First, store the mapped value to the local variable (it is string array). Then convert the string array to objects. Then append the objects to the List property.