Start to display user groups

lib/models/api_response.dart

@@ -16,4 +16,13 @@ class APIResponse {
 
   /// Check if the request is successful or not
   bool get isOK => code == 200;
+
+  /// Make sure the request succeed, or throw an exception else
+  APIResponse assertOk() {
+
+    if(!this.isOK)
+      throw Exception("Request failed with status $code");
+
+    return this;
+  }
 }

lib/models/group.dart

@@ -22,6 +22,7 @@ enum GroupPostCreationLevel { MODERATORS, MEMBERS }
 class Group {
   final int id;
   final String name;
+  final String iconURL;
   final int numberMembers;
   final GroupMembershipLevel membershipLevel;
   final GroupVisibilityLevel visibilityLevel;
@@ -33,6 +34,7 @@ class Group {
   Group({
     @required this.id,
     @required this.name,
+    @required this.iconURL,
     @required this.numberMembers,
     @required this.membershipLevel,
     @required this.visibilityLevel,
@@ -42,6 +44,7 @@ class Group {
     @required this.following,
   })  : assert(id != null),
         assert(name != null),
+        assert(iconURL != null),
         assert(numberMembers != null),
         assert(membershipLevel != null),
         assert(visibilityLevel != null),