ruby on rails 3 - ActiveRecord Query Where Last has_many Record Matches -


I have a class, we can contact with a number of changes ... 

  The class contact has_many: contact for transition ... and class transition ... and   
 What I want to do is find out all those contacts whose  last < / Em> In transit 'system', obviously, there is a  display_ by  column in the transition that can be 'system' or 'user' Sh am, but really what I need. I'm thinking from something ...  
  get contact ((transition). Where ('transitions.performed_by =', 'system')   
 but it will receive all those contacts who have  any  infection with 'system' And I only believe that you can try this  
 
 
 
 Code> contact = contacts.first contact.transitions.where (: performed_by = & gt; 'system'). Previous

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