类 Date

参见 as_json.

# File json/lib/json/add/date.rb, line 10
def self.json_create(object)
  civil(*object.values_at('y', 'm', 'd', 'sg'))
end

方法 Date#as_json 和 Date.json_create 可用于序列化和反序列化 Date 对象；参见 Marshal.

方法 Date#as_json 序列化 self，返回一个表示 self 的 2 元素哈希表

require 'json/add/date'
x = Date.today.as_json
# => {"json_class"=>"Date", "y"=>2023, "m"=>11, "d"=>21, "sg"=>2299161.0}

方法 JSON.create 反序列化此类哈希表，返回一个 Date 对象

Date.json_create(x)
# => #<Date: 2023-11-21 ((2460270j,0s,0n),+0s,2299161j)>

# File json/lib/json/add/date.rb, line 32
def as_json(*)
  {
    JSON.create_id => self.class.name,
    'y' => year,
    'm' => month,
    'd' => day,
    'sg' => start,
  }
end

返回一个表示 self 的 JSON 字符串

require 'json/add/date'
puts Date.today.to_json

输出

{"json_class":"Date","y":2023,"m":11,"d":21,"sg":2299161.0}

# File json/lib/json/add/date.rb, line 51
def to_json(*args)
  as_json.to_json(*args)
end