instance method validate_credential

# File activerecord/lib/active_record/encryption/scheme.rb, line 83
        def validate_credential(key, error_message = "is not configured")
          unless ActiveRecord::Encryption.config.public_send(key).present?
            raise Errors::Configuration, "#{key} #{error_message}. Please configure it via credential "\
              "active_record_encryption.#{key} or by setting config.active_record.encryption.#{key}"
          end
        end