ruby - Alternative to deeply nested resources in rails 3.2 -

What is an option to deepen my resources? I do not want the following design:

  Resources: Users use resources: Dashboard do resources: Comments, End of chart end   
 A user has a dashboard and there will be several charts and comments in the dashboard.  
 What is the alternative? I have heard that it is not good to deeply like the nesting routes. Or not more than at least 1 level  
 Thank you in advance.  
  
 
 
 Finally, for most user convenience in the URL, if it is understandable for nesting So, it should be there.  
 I think, : User  is for authentication and authorization. Therefore, it will be logical to not see  / users / 2 /  at the beginning of each URL, unless people can see each other's dashboard