change_credentials_in_system_editor

# File railties/lib/rails/commands/credentials/credentials_command.rb, line 97
        def change_credentials_in_system_editor
          using_system_editor do
            say "Editing #{content_path}..."
            credentials.change { |tmp_path| system_editor(tmp_path) }
            say "File encrypted and saved."
            warn_if_credentials_are_invalid
          end
        rescue ActiveSupport::EncryptedFile::MissingKeyError => error
          say error.message
        rescue ActiveSupport::MessageEncryptor::InvalidMessage
          say "Couldn't decrypt #{content_path}. Perhaps you passed the wrong key?"
        end