backend/app/representations/post_repr.rb

@@ -8,7 +8,7 @@ module PostRepr
 
   def base post, current_user = nil
     json = post.as_json(BASE)
-    return json unless current_user
+    return json.merge(viewed: false) unless current_user
 
     viewed = current_user.viewed?(post)
     json.merge(viewed:)