Fix the sharedWith attribute in folders

lib/db/folders_db.dart

@@ -99,9 +99,7 @@ class FoldersDB {
       row[columnName],
       row[columnOwnerID],
       row[columnDeviceFolder],
-      (jsonDecode(row[columnSharedWith]) as List<dynamic>)
-          .cast<String>()
-          .toSet(),
+      (jsonDecode(row[columnSharedWith]) as List<dynamic>).cast<int>().toSet(),
       row[columnUpdationTime],
     );
   }

lib/folder_service.dart

@@ -133,18 +133,23 @@ class FolderSharingService {
         .then((response) {
       return Folder.fromMap(response.data);
     }).catchError((e) {
-      return Folder(
-        null,
-        Configuration.instance.getUsername() + "s " + deviceFolder,
-        Configuration.instance.getUserID(),
-        deviceFolder,
-        Set<String>(),
-        null,
-      );
+      try {
+        return Folder(
+          null,
+          Configuration.instance.getUsername() + "s " + deviceFolder,
+          Configuration.instance.getUserID(),
+          deviceFolder,
+          Set<int>(),
+          null,
+        );
+      } catch (e) {
+        _logger.severe(e);
+        return null;
+      }
     });
   }
 
-  Future<Map<String, bool>> getSharingStatus(Folder folder) async {
+  Future<Map<int, bool>> getSharingStatus(Folder folder) async {
     return _dio
         .get(
       Configuration.instance.getHttpEndpoint() + "/users",
@@ -153,7 +158,7 @@ class FolderSharingService {
     )
         .then((response) {
       final users = (response.data["users"] as List).toList();
-      final result = Map<String, bool>();
+      final result = Map<int, bool>();
       for (final user in users) {
         if (user != Configuration.instance.getUsername()) {
           result[user] = folder.sharedWith.contains(user);

lib/models/folder.dart

@@ -7,7 +7,7 @@ class Folder {
   final String name;
   final int ownerID;
   final String deviceFolder;
-  final Set<String> sharedWith;
+  final Set<int> sharedWith;
   final int updationTime;
   File thumbnailPhoto;
 
@@ -28,7 +28,7 @@ class Folder {
       map['name'],
       map['ownerID'],
       map['deviceFolder'],
-      Set<String>.from(map['sharedWith']),
+      Set<int>.from(map['sharedWith']),
       map['updationTime'],
     );
   }

lib/ui/share_folder_widget.dart

@@ -24,7 +24,7 @@ class _ShareFolderWidgetState extends State<ShareFolderWidget> {
 
   @override
   Widget build(BuildContext context) {
-    return FutureBuilder<Map<String, bool>>(
+    return FutureBuilder<Map<int, bool>>(
       future:
           FolderSharingService.instance.getFolder(widget.path).then((folder) {
         _folder = folder;
@@ -42,7 +42,7 @@ class _ShareFolderWidgetState extends State<ShareFolderWidget> {
     );
   }
 
-  Widget _getSharingDialog(Map<String, bool> sharingStatus) {
+  Widget _getSharingDialog(Map<int, bool> sharingStatus) {
     return AlertDialog(
       title: Text('Share "' + widget.title + '" with'),
       content: SingleChildScrollView(
@@ -56,7 +56,7 @@ class _ShareFolderWidgetState extends State<ShareFolderWidget> {
         FlatButton(
           child: Text("Share"),
           onPressed: () async {
-            var sharedWith = Set<String>();
+            var sharedWith = Set<int>();
             for (var user in sharingStatus.keys) {
               if (sharingStatus[user]) {
                 sharedWith.add(user);
@@ -75,7 +75,7 @@ class _ShareFolderWidgetState extends State<ShareFolderWidget> {
 }
 
 class SharingCheckboxWidget extends StatefulWidget {
-  final Map<String, bool> sharingStatus;
+  final Map<int, bool> sharingStatus;
 
   const SharingCheckboxWidget(
     this.sharingStatus, {
@@ -87,7 +87,7 @@ class SharingCheckboxWidget extends StatefulWidget {
 }
 
 class _SharingCheckboxWidgetState extends State<SharingCheckboxWidget> {
-  Map<String, bool> _sharingStatus;
+  Map<int, bool> _sharingStatus;
 
   @override
   void initState() {
@@ -109,7 +109,7 @@ class _SharingCheckboxWidgetState extends State<SharingCheckboxWidget> {
                   _sharingStatus[user] = value;
                 });
               }),
-          Text(user),
+          Text(user.toString()),
         ],
       ));
     }