:8ball:  be careful. This is dangerous :warning:  you have the n+1 problem here ( line 30 ```h(customer.versions.first.whodunnit)```  )
please check out this for more information http://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations 
The solutions is easy only you change 
```customers``` to  ```customers.includes(:versions)```