Ready to build presence section

lib/models/advanced_group_info.dart

@@ -17,6 +17,7 @@ class AdvancedGroupInfo extends Group implements LikeElement {
   int likes;
   bool userLike;
   List<Conversation> conversations;
+  bool isForezGroup;
 
   AdvancedGroupInfo({
     @required int id,
@@ -36,7 +37,9 @@ class AdvancedGroupInfo extends Group implements LikeElement {
     @required this.likes,
     @required this.userLike,
     @required this.conversations,
-  }) : super(
+    @required this.isForezGroup,
+  })  : assert(isForezGroup != null),
+        super(
             id: id,
             name: name,
             iconURL: iconURL,

lib/models/group.dart

@@ -19,7 +19,7 @@ enum GroupRegistrationLevel { OPEN, MODERATED, CLOSED }
 
 enum GroupPostCreationLevel { MODERATORS, MEMBERS }
 
-class Group {
+class Group implements Comparable<Group> {
   final int id;
   String name;
   final String iconURL;
@@ -70,4 +70,7 @@ class Group {
       membershipLevel == GroupMembershipLevel.MODERATOR ||
       (membershipLevel == GroupMembershipLevel.MEMBER &&
           postCreationLevel == GroupPostCreationLevel.MEMBERS);
+
+  @override
+  int compareTo(Group other) => id.compareTo(other.id);
 }