Update models

lib/data/models/group_model.dart

@@ -46,8 +46,7 @@ abstract class GroupItemResponse
 
 class GroupFields {
   static const String name = 'name';
-  static const String custom1 = 'custom1';
+  static const String documents = 'documents';
-  static const String custom2 = 'custom2';
 }
 
 abstract class GroupEntity extends Object
@@ -65,6 +64,7 @@ abstract class GroupEntity extends Object
       createdAt: 0,
       assignedUserId: '',
       createdUserId: '',
+      documents: BuiltList<DocumentEntity>(),
     );
   }
 
@@ -83,6 +83,9 @@ abstract class GroupEntity extends Object
 
   SettingsEntity get settings;
 
+  @nullable
+  BuiltList<DocumentEntity> get documents;
+
   @override
   String get listDisplayName {
     return name;

lib/ui/group/view/group_view.dart

@@ -29,7 +29,21 @@ class GroupView extends StatefulWidget {
   _GroupViewState createState() => new _GroupViewState();
 }
 
-class _GroupViewState extends State<GroupView> {
+class _GroupViewState extends State<GroupView> with SingleTickerProviderStateMixin {
+  TabController _controller;
+
+    @override
+  void initState() {
+    super.initState();
+    _controller = TabController(vsync: this, length: 2);
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     final localization = AppLocalization.of(context);