code: public CollectionRequest<Task> getTasksWithTag(String tag) {
      
          String path = String.format("/tags/%s/tasks", tag);
          return new CollectionRequest<Task>(this, Task.class, path, "GET");
      }
docs: Returns the compact task records for all tasks with the given tag.
  Tasks can have more than one tag at a time.
  
  @param  tag The tag to fetch tasks from.
  @return Request object