ruby on rails - Update if exists, else do nothing? -

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I am trying to update a value of the model if only the model is present. If it does not happen, then I do nothing, the search returns only to renewal or question / answer, but I do not want to make it.

I know that I can do it with a simple one: 

  found = model.find_b_id (id) if the end of the updated content is found   
 However, I think it is a way of doing this without specifying any temporary local values ​​in a call or if you have to.  
 How do I write a rail, which will update the record of no noise errors, is not it present?  
 The latest Rail 3.x   
 
 
 You can use the method < Rails before calling update_attributes on the result of Code> find_by_id  or  where   
  Try  back  zero  If the exception is not present, then there is no silent record. If the record is present, then it will be updated.  
  found = model.fund_b_id () .try (: update_attributes, {key: value})

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