update!

# File activerecord/lib/active_record/persistence.rb, line 434
      def update!(id = :all, attributes)
        if id.is_a?(Array)
          if id.any?(ActiveRecord::Base)
            raise ArgumentError,
              "You are passing an array of ActiveRecord::Base instances to `update!`. "                "Please pass the ids of the objects by calling `pluck(:id)` or `map(&:id)`."
          end
          id.map { |one_id| find(one_id) }.each_with_index { |object, idx|
            object.update!(attributes[idx])
          }
        elsif id == :all
          all.each { |record| record.update!(attributes) }
        else
          if ActiveRecord::Base === id
            raise ArgumentError,
              "You are passing an instance of ActiveRecord::Base to `update!`. "                "Please pass the id of the object by calling `.id`."
          end
          object = find(id)
          object.update!(attributes)
          object
        end
      end