brunabaudel · October 6, 2023 08:58 · Oct 6, 2023
diff --git a/BlogPost b/BlogPost
@@ -0,0 +1,112 @@
+import Foundation
+
+struct User: Codable {
+    var username: String
+    var email: String
+}
+
+struct Comment: Codable {
+    var text: String
+    var date: Date
+    var user: User
+}
+
+struct BlogPost: Codable {
+    var title: String
+    var content: String
+    var datePublished: Date
+    var comments: [Comment]
+
+    enum CodingKeys: String, CodingKey {
+        case title
+        case content
+        case datePublished = "date_published"
+        case comments
+    }
+
+    enum CommentCodingKeys: String, CodingKey {
+        case text
+        case date
+        case user
+    }
+
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        title = try container.decode(String.self, forKey: .title)
+        content = try container.decode(String.self, forKey: .content)
+        datePublished = try container.decode(Date.self, forKey: .datePublished)
+
+        var commentsContainer = try container.nestedUnkeyedContainer(forKey: .comments)
+        var commentsArray: [Comment] = []
+        while !commentsContainer.isAtEnd {
+            let commentContainer = try commentsContainer.nestedContainer(keyedBy: CommentCodingKeys.self)
+            let text = try commentContainer.decode(String.self, forKey: .text)
+            let date = try commentContainer.decode(Date.self, forKey: .date)
+            let user = try commentContainer.decode(User.self, forKey: .user)
+            let comment = Comment(text: text, date: date, user: user)
+            commentsArray.append(comment)
+        }
+        comments = commentsArray
+    }
+
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(title, forKey: .title)
+        try container.encode(content, forKey: .content)
+        try container.encode(datePublished, forKey: .datePublished)
+
+        var commentsContainer = container.nestedUnkeyedContainer(forKey: .comments)
+        for comment in comments {
+            var commentContainer = commentsContainer.nestedContainer(keyedBy: CommentCodingKeys.self)
+            try commentContainer.encode(comment.text, forKey: .text)
+            try commentContainer.encode(comment.date, forKey: .date)
+            try commentContainer.encode(comment.user, forKey: .user)
+        }
+    }
+}
+
+let json = """
+{
+    "title": "Sample Blog Post",
+    "content": "This is the content of the blog post.",
+    "date_published": "2023-10-06T08:00:00Z",
+    "comments": [
+        {
+            "text": "Great post!",
+            "date": "2023-10-06T10:00:00Z",
+            "user": {
+                "username": "user1",
+                "email": "[email protected]"
+            }
+        },
+        {
+            "text": "Thanks for sharing.",
+            "date": "2023-10-06T11:00:00Z",
+            "user": {
+                "username": "user2",
+                "email": "[email protected]"
+            }
+        }
+    ]
+}
+"""
+
+let decoder = JSONDecoder()
+decoder.dateDecodingStrategy = .iso8601
+decoder.keyDecodingStrategy = .convertFromSnakeCase
+
+do {
+    let blogPost = try decoder.decode(BlogPost.self, from: Data(json.utf8))
+    print("Title: \(blogPost.title)")
+    print("Content: \(blogPost.content)")
+    print("Date Published: \(blogPost.datePublished)")
+    print("Comments:")
+    for comment in blogPost.comments {
+        print("  Text: \(comment.text)")
+        print("  Date: \(comment.date)")
+        print("  User: \(comment.user.username) (\(comment.user.email))")
+        print("-----")
+    }
+} catch {
+    print("Error decoding JSON: \(error)")
+}