read_value

# File activerecord/lib/active_record/attribute_assignment.rb, line 114
      def read_value
        return if values.values.compact.empty?

        @column = object.class.reflect_on_aggregation(name.to_sym) || object.column_for_attribute(name)
        klass   = column.klass

        if klass == Time
          read_time
        elsif klass == Date
          read_date
        else
          read_other(klass)
        end
      end