diff --git a/lib/models/comment/comment.dart b/lib/models/comment/comment.dart
index 4a53a4a..b4f43ea 100644
--- a/lib/models/comment/comment.dart
+++ b/lib/models/comment/comment.dart
@@ -3,7 +3,7 @@ import 'reply.dart';
 import 'user.dart';
 
 class CommentData {
-  final int id;
+  int id;
   final String text;
   final String createdAt;
   final bool liked;
diff --git a/lib/models/item_overview.dart b/lib/models/item_overview.dart
index 50ddec4..3832850 100644
--- a/lib/models/item_overview.dart
+++ b/lib/models/item_overview.dart
@@ -5,14 +5,15 @@ class ItemOverview {
   final String title;
   final String image;
   final String description;
-  final int timeToRead;
-  final String reference;
-  final bool forManagers;
+  final int? timeToRead;
+  final String? reference;
+  final bool? forManagers;
   final String createdAt;
-  final String type;
-  final List<Category> categories;
+  final String? type;
+  final List<Category>? categories;
+  int? comments;
 
-  const ItemOverview({
+  ItemOverview({
     required this.id,
     required this.title,
     required this.image,
@@ -23,6 +24,7 @@ class ItemOverview {
     required this.createdAt,
     required this.type,
     required this.categories,
+    required this.comments,
   });
 
   factory ItemOverview.fromJson(Map<String, dynamic> json) => ItemOverview(
@@ -35,11 +37,14 @@ class ItemOverview {
         forManagers: json['forManagers'],
         createdAt: json['createdAt'],
         type: json['type'],
-        categories: List<Category>.from(
-          json['categories'].map(
-            (cat) => Category.fromJson(cat),
-          ),
-        ),
+        comments: json['comments'],
+        categories: json['categories'] == null
+            ? null
+            : List<Category>.from(
+                json['categories'].map(
+                  (cat) => Category.fromJson(cat),
+                ),
+              ),
       );
 
   Map<String, dynamic> toJson() => {
@@ -52,6 +57,6 @@ class ItemOverview {
         'forManagers': forManagers,
         'createdAt': createdAt,
         'type': type,
-        'categories': categories.map((e) => e.toJson()).toList(),
+        'categories': categories?.map((e) => e.toJson()).toList(),
       };
 }
diff --git a/lib/models/news_details_data.dart b/lib/models/news_details_data.dart
index c5ead9e..1b603bd 100644
--- a/lib/models/news_details_data.dart
+++ b/lib/models/news_details_data.dart
@@ -8,12 +8,12 @@ class NewsDetailsData {
   final String image;
   final String createdAt;
   final bool marked;
-  final int comments;
+  int comments;
   final int order;
   final List<Tag> tags;
   final List<Content> contents;
 
-  const NewsDetailsData({
+  NewsDetailsData({
     required this.id,
     required this.title,
     required this.reference,
diff --git a/lib/models/radar_details_data.dart b/lib/models/radar_details_data.dart
index fb2aecd..fb493e3 100644
--- a/lib/models/radar_details_data.dart
+++ b/lib/models/radar_details_data.dart
@@ -12,13 +12,13 @@ class RadarDetailsData {
   final String? podcast;
   final bool forManagers;
   final bool marked;
-  final int comments;
+  int comments;
   final List<Tag> tags;
   final List<Content> contents;
   final List<Category> categories;
   final int order;
 
-  const RadarDetailsData({
+  RadarDetailsData({
     required this.id,
     required this.title,
     required this.image,
diff --git a/lib/models/radar_overview.dart b/lib/models/radar_overview.dart
index 16e5c12..a601084 100644
--- a/lib/models/radar_overview.dart
+++ b/lib/models/radar_overview.dart
@@ -10,7 +10,7 @@ class RadarOverview {
   final bool forManagers;
   bool marked;
   final List<Category> categories;
-  final int comments;
+  int comments;
 
   RadarOverview({
     required this.id,
diff --git a/lib/models/requests/radar.dart b/lib/models/requests/radar.dart
index 9a28fae..12e7e24 100644
--- a/lib/models/requests/radar.dart
+++ b/lib/models/requests/radar.dart
@@ -4,6 +4,7 @@ class RadarRequestArgs {
   final String? startDate;
   final String? endDate;
   final String? search;
+  final bool? isSingleItem;
 
   const RadarRequestArgs({
     required this.page,
@@ -11,5 +12,6 @@ class RadarRequestArgs {
     this.startDate,
     this.endDate,
     this.search,
+    this.isSingleItem,
   });
 }