Handle a documents directory that can change

Thanks iOS

ios/App/Shared/models/LocalLibrary.swift

@@ -11,23 +11,87 @@ import Unrealm
 struct LocalLibraryItem: Realmable, Codable {
     var id: String = "local_\(UUID().uuidString)"
     var basePath: String = ""
-    var absolutePath: String = ""
-    var contentUrl: String = ""
+    dynamic var _contentUrl: String?
     var isInvalid: Bool = false
     var mediaType: String = ""
     var media: MediaType?
     var localFiles: [LocalFile] = []
-    var coverContentUrl: String?
-    var coverAbsolutePath: String?
+    dynamic var _coverContentUrl: String?
     var isLocal: Bool = true
     var serverConnectionConfigId: String?
     var serverAddress: String?
     var serverUserId: String?
     var libraryItemId: String?
     
+    var contentUrl: String? {
+        set(url) {
+            _contentUrl = url
+        }
+        get {
+            if let path = _contentUrl {
+                return AbsDownloader.downloadsDirectory.appendingPathComponent(path).absoluteString
+            } else {
+                return nil
+            }
+        }
+    }
+    
+    var coverContentUrl: String? {
+        set(url) {
+            _coverContentUrl = url
+        }
+        get {
+            if let path = self._coverContentUrl {
+                return AbsDownloader.downloadsDirectory.appendingPathComponent(path).absoluteString
+            } else {
+                return nil
+            }
+        }
+    }
+    
     static func primaryKey() -> String? {
         return "id"
     }
+    
+    private enum CodingKeys : String, CodingKey {
+        case id, basePath, contentUrl, isInvalid, mediaType, media, localFiles, coverContentUrl, isLocal, serverConnectionConfigId, serverAddress, serverUserId, libraryItemId
+    }
+    
+    init() {}
+    
+    init(from decoder: Decoder) throws {
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        id = try values.decode(String.self, forKey: .id)
+        basePath = try values.decode(String.self, forKey: .basePath)
+        contentUrl = try values.decode(String.self, forKey: .contentUrl)
+        isInvalid = try values.decode(Bool.self, forKey: .isInvalid)
+        mediaType = try values.decode(String.self, forKey: .mediaType)
+        media = try values.decode(MediaType.self, forKey: .media)
+        localFiles = try values.decode([LocalFile].self, forKey: .localFiles)
+        coverContentUrl = try values.decode(String.self, forKey: .coverContentUrl)
+        isLocal = try values.decode(Bool.self, forKey: .isLocal)
+        serverConnectionConfigId = try values.decode(String.self, forKey: .serverConnectionConfigId)
+        serverAddress = try values.decode(String.self, forKey: .serverAddress)
+        serverUserId = try values.decode(String.self, forKey: .serverUserId)
+        libraryItemId = try values.decode(String.self, forKey: .libraryItemId)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(id, forKey: .id)
+        try container.encode(basePath, forKey: .basePath)
+        try container.encode(contentUrl, forKey: .contentUrl)
+        try container.encode(isInvalid, forKey: .isInvalid)
+        try container.encode(mediaType, forKey: .mediaType)
+        try container.encode(media, forKey: .media)
+        try container.encode(localFiles, forKey: .localFiles)
+        try container.encode(coverContentUrl, forKey: .coverContentUrl)
+        try container.encode(isLocal, forKey: .isLocal)
+        try container.encode(serverConnectionConfigId, forKey: .serverConnectionConfigId)
+        try container.encode(serverAddress, forKey: .serverAddress)
+        try container.encode(serverUserId, forKey: .serverUserId)
+        try container.encode(libraryItemId, forKey: .libraryItemId)
+    }
 }
 
 struct LocalPodcastEpisode: Realmable, Codable {
@@ -53,13 +117,40 @@ struct LocalFile: Realmable, Codable {
     var id: String = UUID().uuidString
     var filename: String?
     var contentUrl: String = ""
-    var absolutePath: String = ""
+    var absolutePath: String {
+        return AbsDownloader.downloadsDirectory.appendingPathComponent(self.contentUrl).absoluteString
+    }
     var mimeType: String?
     var size: Int = 0
     
     static func primaryKey() -> String? {
         return "id"
     }
+    
+    private enum CodingKeys : String, CodingKey {
+        case id, filename, contentUrl, absolutePath, mimeType, size
+    }
+    
+    init() {}
+    
+    init(from decoder: Decoder) throws {
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        id = try values.decode(String.self, forKey: .id)
+        filename = try values.decode(String.self, forKey: .filename)
+        contentUrl = try values.decode(String.self, forKey: .contentUrl)
+        mimeType = try values.decode(String.self, forKey: .mimeType)
+        size = try values.decode(Int.self, forKey: .size)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(id, forKey: .id)
+        try container.encode(filename, forKey: .filename)
+        try container.encode(contentUrl, forKey: .contentUrl)
+        try container.encode(absolutePath, forKey: .absolutePath)
+        try container.encode(mimeType, forKey: .mimeType)
+        try container.encode(size, forKey: .size)
+    }
 }
 
 struct LocalMediaProgress: Realmable, Codable {