PostModelWithCustomTransformation.swift

class Post: Mappable {
    var postId: String?
    var title: String?
    var content: String?
    var author: String?
    var likes: [String]?
    
    func mapping(map: Map) {
        postId <- map[Post.firebaseIdKey]
        title <- map["title"]
        content <- map["content"]
        author <- map["author"]
        likes <- (map["likes"], DictionaryKeyTransform())
    }
    required init?(map: Map) { }
}