Mongodb 在 Mongoid 中，Date、Time、DateTime 和 TimeWithZone 字段类型有什么区别吗

它们之间几乎没有区别，都是包装时间类型.

Mongoid扩展了这个类，为数据绑定添加demongoize/mongoize方法.因此，唯一的区别在于实施.

所以，现在是实施的时候了

def demongoize(object)
  return nil if object.blank?
  object = object.getlocal unless Mongoid::Config.use_utc?
  if Mongoid::Config.use_activesupport_time_zone?
    object = object.in_time_zone(Mongoid.time_zone)
  end
  object
end

def mongoize(object)
  return nil if object.blank?
  begin
    time = object.__mongoize_time__
    if object.respond_to?(:sec_fraction)
      ::Time.at(time.to_i, object.sec_fraction * 10**6).utc
    elsif time.respond_to?(:subsec)
      ::Time.at(time.to_i, time.subsec * 10**6).utc
    else
      ::Time.at(time.to_i, time.usec).utc
    end
  rescue ArgumentError
    EPOCH
  end
end

实施日期

def demongoize(object)
  ::Date.new(object.year, object.month, object.day) if object
end


def mongoize(object)
  unless object.blank?
    begin
      time = object.__mongoize_time__
      ::Time.utc(time.year, time.month, time.day)
    rescue ArgumentError
      EPOCH
    end
  end
end

你可以查看其他暗示

https://github.com/mongoid/mongoid/blob/master/lib/mongoid/extensions/date.rb#L46