Wsrtjtyk

I'm new in iOS development, so sorry for stupid question in advance.
I have json like this:

{

   "type":"post",

   "comments":{

      "count":0,

      "can_post":1

   },

   "likes":{

      "count":0,

      "user_likes":0,

      "can_like":1,

      "can_publish":1

   },

   "reposts":{

      "count":0,

      "user_reposted":0

   }

}

I want to convert this to class which will contain just likesCount, commentsCount, repostsCount but without creating separate classes for comments, likes, reposts. I'm using Decodable for this and here is my code which doesn't work :)

Code:

final class FeedItem: Decodable {

    enum Keys: String, CodingKey {

        case type,

        likes = "likes.count",

        comments = "comments.count",

        reposts = "reposts.count"

    }



    let type: String

    var likes = 0

    var comments = 0

    var reposts = 0



    required convenience init(from decoder: Decoder) throws {

        let container = try decoder.container(keyedBy: Keys.self)

        let type = try container.decode(String.self, forKey: .type)

        let likes = try container.decode(Int.self, forKey: .likes)

        let comments = try container.decode(Int.self, forKey: .comments)

        let reposts = try container.decode(Int.self, forKey: .reposts)

        self.init(type: type, likes: likes, comments: comments, reposts: reposts)

    }



    init(type: String,

         likes: Int,

         comments: Int,

         reposts: Int) {

        self.type = type

        self.likes = likes

        self.comments = comments

        self.reposts = reposts

    }

}

Error:

"No value associated with key Keys(stringValue: "likes.count", intValue: nil) ("likes.count")."

The error is very clear, there are no values for associate keys likes.count as the key not exists.

Use

let container = try decoder.container(keyedBy: CodingKeys.self)

and try container.decodeIfPresent(:_) to check for key exists or if not assign empty value.

Code:

struct FeedItem: Codable {



    let type: String

    let commentsCount: Int

    let canPostComment: Int

    let likesCount: Int

    let userLikes: Int

    let canLike: Int

    let canPublish: Int

    let repostsCount: Int

    let userReposted: Int



    enum CodingKeys: String, CodingKey {

        case type = "type"

        case comments = "comments"

        case likes = "likes"

        case reposts = "reposts"

        case count = "count"

        case canPost = "can_post"

        case userLikes = "user_likes"

        case canLike = "can_like"

        case canPublish = "can_publish"

        case userReposted = "user_reposted"

    }



    init(from decoder: Decoder) throws {



        let container = try decoder.container(keyedBy: CodingKeys.self)

        self.type = try container.decodeIfPresent(String.self, forKey: .type) ?? ""



        let comments = try container.nestedContainer(keyedBy: CodingKeys.self, forKey: .comments)

        self.commentsCount = try comments.decodeIfPresent(Int.self, forKey: .count) ?? 0

        self.canPostComment = try comments.decodeIfPresent(Int.self, forKey: .canPost) ?? 0



        let likes = try container.nestedContainer(keyedBy: CodingKeys.self, forKey: .likes)

        self.likesCount = try likes.decodeIfPresent(Int.self, forKey: .count) ?? 0

        self.userLikes = try likes.decodeIfPresent(Int.self, forKey: .userLikes) ?? 0

        self.canLike = try likes.decodeIfPresent(Int.self, forKey: .canLike) ?? 0

        self.canPublish = try likes.decodeIfPresent(Int.self, forKey: .canPublish) ?? 0



        let reposts = try container.nestedContainer(keyedBy: CodingKeys.self, forKey: .reposts)

        self.repostsCount = try reposts.decodeIfPresent(Int.self, forKey: .count) ?? 0

        self.userReposted = try reposts.decodeIfPresent(Int.self, forKey: .userReposted) ?? 0

    }



    func encode(to encoder: Encoder) throws {



        var container = encoder.container(keyedBy: CodingKeys.self)

        try container.encode(type, forKey: .type)



        var comments = container.nestedContainer(keyedBy: CodingKeys.self, forKey: .comments)

        try comments.encode(commentsCount, forKey: .count)

        try comments.encode(canPostComment, forKey: .canPost)



        var likes = container.nestedContainer(keyedBy: CodingKeys.self, forKey: .likes)

        try likes.encode(likesCount, forKey: .count)

        try likes.encode(userLikes, forKey: .userLikes)

        try likes.encode(canLike, forKey: .canLike)

        try likes.encode(canPublish, forKey: .canPublish)



        var reposts = container.nestedContainer(keyedBy: CodingKeys.self, forKey: .reposts)

        try reposts.encode(repostsCount, forKey: .count)

        try reposts.encode(userReposted, forKey: .userReposted)

    }

}

Data Reading:

let data = //Your JSON data from API

let jsonData = try JSONDecoder().decode(FeedItem.self, from: data)

print("(jsonData.type) (jsonData.canLike)")