[Rails Tutorial] "NoMethodError (undefined method` activation_digest ='for # <User: 0x00000003156938>

"NoMethodError (undefined method `activation_digest=' for #User:0x00000003156938

about

For some reason I saw this error only in the production environment

user.rb

    def activate
      self.update_attribute(:activated,    true)
      self.update_attribute(:activated_at, Time.zone.now)
    end

I forgot to add self.

Why was there no problem if it was local?

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