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Martin Hope
armoyt
Asked: 2022-07-10 02:36:28 +0800 CST
  • 0

学习 Tadayoshi Funaba 日历程序 (cal.rb)

首先，为日历创建一个星期指定数组，以根据当前日期工作：

 require 'date'
 fi = Date.new(1, 1, 1)
 ve  = (fi..fi +  6).collect{|cu|
  %w(Вс Пн Вт Ср Чт Пт Сб)[cu.wday]
 }
 => ["Сб", "Вс", "Пн", "Вт", "Ср", "Чт", "Пт"]

这里的数组对于任何初学者来说都像往常一样。然后将月份中的天数添加到此数组中，以获得将其转换为给定月份的日历输出所需的存根数组：

ve += (fi..fi + 41).collect{|cu|
 if cu.mon == 1 then cu.send(:mday) end.to_s
}
=>
["Сб",
 "Вс",
 "Пн",
 "Вт",
 "Ср",
 "Чт",
 "Пт",
 "1",
 "2",
 "3",
 "4",
 "5",
 "6",
 "7",
 "8",
 "9",
 "10",
 "11",
 "12",
 "13",
 "14",
 "15",
 "16",
 "17",
 "18",
 "19",
 "20",
 "21",
 "22",
 "23",
 "24",
 "25",
 "26",
 "27",
 "28",
 "29",
 "30",
 "31",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 ""]

然后我们得到一堆换行符，就像它是一个多字符串，而不是一个数组......它们来自哪里，它是如何工作的？

此外，选择子阵列时将保留这些翻译：

(0..ve.size / 7 - 1).collect{|i| ve[i * 7, 7]}
=>
[["Сб", "Вс", "Пн", "Вт", "Ср", "Чт", "Пт"],
 [" 1", " 2", " 3", " 4", " 5", " 6", " 7"],
 [" 8", " 9", "10", "11", "12", "13", "14"],
 ["15", "16", "17", "18", "19", "20", "21"],
 ["22", "23", "24", "25", "26", "27", "28"],
 ["29", "30", "31", "  ", "  ", "  ", "  "],
 ["  ", "  ", "  ", "  ", "  ", "  ", "  "]]

我完全不明白数组会发生什么，也许是没有详细解释的日期模块方法的一些影响？

ruby
Martin Hope
armoyt
Asked: 2022-06-27 03:56:33 +0800 CST
  • 0

我正在关注 Ruby 教程。我的任务是了解如何将对象保存到 yaml 字符串并使用标准 YAML 模块恢复它们，但我遇到了一个失败的教程代码：

require 'yaml'

class Person
  attr_accessor :first_name, :last_name, :patronymic, :password
  def initialize(first_name:, last_name:, patronymic:, password:)
    @first_name = first_name
    @last_name = last_name
    @patronymic = patronymic
    @password = password
  end
end

person = Person.new(
  first_name: 'Иван',
  last_name: 'Петрович',
  patronymic: 'Сидоров',
  password: 'qwerty'
)

yaml_str = YAML.dump(person)    # интересует именно эта часть кода,
recovered = YAML.load(yaml_str) # чтобы восстановить объект из той же переменной

p recovered.first_name # "Иван"
p recovered.last_name  # "Петрович"
p recovered.patronymic # "Сидоров"
p recovered.password   # "qwerty"

该程序输出以下内容：

C:/Ruby31-x64/lib/ruby/3.1.0/psych/class_loader.rb:99:in `find': Tried to load unspecified class: Person (Psych::DisallowedClass)
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/class_loader.rb:28:in `load'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:424:in `resolve_class'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:213:in `visit_Psych_Nodes_Mapping'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/visitor.rb:30:in `visit'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/visitor.rb:6:in `accept'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:35:in `accept'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:318:in `visit_Psych_Nodes_Document'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/visitor.rb:30:in `visit'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/visitor.rb:6:in `accept'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:35:in `accept'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych.rb:335:in `safe_load'
        from C:/Ruby31-x64/lib/ruby/3.1.0/psych.rb:370:in `load'
        from C:/Users/armoy/OneDrive/Documents/selflearning_book/FTP/modules/yaml_load.rb:21:in `<main>'

宝石 psych-4.0.3。YAML 模块的 load 方法的 ri 实用程序似乎没有写任何有趣的东西。

ruby