ruby on rails - Locking an attribute after it has a certain value -


I have a model, where it is given a certain position, then the situation can never be changed again By trying to check on the model by first_sev, what is the situation and increase the exception if it is set to fixed position

The problem is - 

  def raise_if_exported if self Is .exported? Taking exception, "Can not change the exported invoice status" End End   
 which works fine but when I initially set the position of export by doing the following -    invoice.states = "exported" invoice. Save   
 An exception has been lifted because the situation has not already been exported to the model, DB (me )  
 Is that feature set to "export" When it is no way to prevent it from changing?   
 
 
 You can use a validator for your requirement  
  Class invoice & lt; ActiveRecord :: Base validates_each: the situation is | Record, atri, value. If (atr ==: status and status_keyword and status_vas == "exported") record. Errors.ed (exported: status, "you can not touch it") end and end   
 now  
  invoice.tustus = " Gone "invoice save # success invoice.Testus =" new "invoice save # error

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