ruby on rails - skip carrierwave Integirty and Processing validation -

I've listed some extensions white in the carrier uploader category

  def extension_white_list% W (Doctor docx)   
 In some cases I want to skip Integrity Verification while saving a record. But according to their documentation validates_integrity_of verification is present by default.  
  
 Can anyone tell me how to leave such recognition?  Uploader / file_uploader.rb   
 
 
 
 
 Code> def extension_white_list model.do_i_need_validation? % W (doc docx) and% w (pdf) ending   
 and define this example method in the model  
  def do_i_need_validation? Bet? ? True: incorrect end   
 Just replace the content of the appropriate method for your app