• decorate_collection 用在 集合 上,decorate 用在实例上。

    • decorate_collection -> Article.all 或者 Article.where(condition) 或者 Article.where(condition).filter(condition) -> 返回一个集合
    • decorate -> Article.first 或者 Article.find(condition) 或者 Article.find_by(condition) 或者 Article.where(condition).filter(condition).detect(condition) -> 返回一个实例

    盲猜:

    # 以下等价
    ArticleDecorator.decorate_collection(Article.all)
    Article.all.each(&:decorate)
    # 以下等价
    Article.first.decorate
    ArticleDecorator.decorate_collection([Article.first])
    
  • 如有这个能力为什么去贵公司?贵公司有什么过人之处?

  • 🐅 I agree with you.

  • It is really a little too expensive. I read almost all his blogs. Although I've always wanted to buy this book on impulse, my pocket always pulls me back to reality.😜

  • 不懂就问,你心目中的面试是怎么面试?

  • 2.6.5 (main):0 > Podcast.frequencies
    => {"unknown"=>0, "daily"=>1, "weekly"=>7, "biweekly"=>14, "monthly"=>31, "periodic"=>366}
    2.6.5 (main):0 > Podcast.where(frequency: ["daily", "weekly"]).count
       (14.0ms)  SELECT COUNT(*) FROM "podcasts" WHERE "podcasts"."frequency" IN ($1, $2)  [["frequency", 1], ["frequency", 7]]
    => 4317
    2.6.5 (main):0 > Podcast.ransack(frequency_in: ["daily", "weekly"]).result.count
       (11.6ms)  SELECT COUNT(*) FROM "podcasts" WHERE "podcasts"."frequency" IN (0, 0)
    => 166
    2.6.5 (main):0 > Podcast.ransack(frequency_in: [1, 7]).result.count
       (14.9ms)  SELECT COUNT(*) FROM "podcasts" WHERE "podcasts"."frequency" IN (1, 7)
    => 4317
    
    
  • 打破零回复。 很多前端包,比如 select2可以直接打包 yarn add select2引入了。

  • 啊 啊啊 今天上午是你?😄

  • 刚入职场的年轻工程师如何判断他/她所要投资的技术是像 2006 年左右的 Rails、2007 年左右的 Hadoop、还是更像 2010 年前后的 MongoDB?有点像投资创业公司,如何押对宝?还是尽量选择无聊的成熟的老技术、专注于解决实际问题、白猫黑猫抓到老鼠就是好猫?

    👏 但是呢,新人毕竟是新人,一头雾水,就想经常逃课的人,要考试了一样,不先看重点,而是去钻研难题,死翘翘了

  • 这么酷炫的技巧...

    def before_action(method_name, options)
      action_module = Module.new do
        send :define_method, options[:for] do |*args, &block|
          send method_name
    
          super(*args, &block)
        end
      end
    
      prepend action_module
    end
    
  • Rails inverse_of 研究 at December 24, 2018

    恍然大悟,突然想起来之前遇到的一个 bug...

  • 最后一个插件就是针对 VIM 的

  • 1. action_name == "create" 
    2. params[:action] == "create" 
    3. request.post?
    
  • 你这个帖子,为什么没有被和谐掉!

  • === 等价于 case when 中的条件判断:

    condition = 'hello'
    case condition
    when String
    when User
    When (1...10)
    when /ello/
    end
    

    更侧重归属感。

  • 啊哈,以为有什么暗黑高科技

  • 我是在 ActiveSupport 扩展里面看到的,想请教一下,你是怎么定位源码的位置的?

  • # use helper
    2.3.3 (main):0 > helper.number_to_currency 7777777
    => "¥ 7,777,777.00"
    # active_support
    2.3.3 (main):0 > 7777777.to_s(:currency)
    => "¥ 7,777,777.00"
    # include precision
    2.3.3 (main):0 > 7777777.to_s(:currency, precision: 3)
    => "¥ 7,777,777.000"
    
  • 这帖子还吵起来了

    class A
      define_singleton_method :loudly do |message|
        puts message.upcase
      end
    end
    
    A.loudly "my message"
    
  • 哈哈哈哈哈嗝

  • AA 是想插入的值/?

  • Awesome Ruby China at July 04, 2018

    整理的简直了... 赞

    1. gen install bundler
    2. bundle install
  • 问题如下:

    » c                                                                                                                                                                                                                                                                                                                                                [ruby-2.4.0][10:00:54]
    /Users/dubing/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- bundler/setup (LoadError)
            from /Users/dubing/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
            from /Users/dubing/workspace/vcooline/code_event_back_service/config/boot.rb:3:in `<top (required)>'
            from bin/rails:3:in `require_relative'
            from bin/rails:3:in `<main>'
    

    1. 重新安装bundler: gem install bundler

      Fetching: bundler-1.16.2.gem (100%)
      Successfully installed bundler-1.16.2
      1 gem installed
      
    2. 然后bundle install

    然后世界顺畅了。

    » c                                                                                                                                                                                                                                                                                                                                                [ruby-2.4.0][10:04:32]
    Loading development environment (Rails 5.0.2)
    gem install awesome_print  # <-- highly recommended
    2.4.0 (main):0 >
    
  • 谨防比特币和区块链骗局 at January 31, 2018

    自己 200 块提心吊胆,别人投了 200W, 旅游北西东南...

  • 环绕别名 at January 19, 2018

    学习到了,你好认真,灰常谢谢你提供的详细的解释。学习了。👏

  • 环绕别名 at January 19, 2018

    我在处理的时候是这样写的

    class User < ApplicationRecord
     avatar
        super || 'default value'
      end 
    end
    

    你的写法,比我的优雅了太多了。相形见绌。

  • 环绕别名 at January 19, 2018

    No effect

  • 环绕别名 at January 19, 2018

    你这里只是使用了 attr_accessor, 接着... 这个是为了,有些人没有上传头像,才会调用默认头像, 可是你这种就会,一直使用默认头像,毕竟 real_avatar始终是空。

  • 环绕别名 at January 19, 2018

    user model:

    
    class User < ApplicationRecord
    
      def avatar
        real_avatar.present? ? "real_avatar" : "default.png"
      end
    
      alias :real_avatar :avatar
    end
    

    执行结果:

    2.4.2 (main):0 > user = User.last
      User Load (0.6ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" DESC LIMIT $1  [["LIMIT", 1]]
    => #<User:0x00007fd3cc9330a8
     id: 2,
     uid: "017526292153702",
     avatar: "http://img2.imgtn.bdimg.com/it/u=3563567972,3348399262&fm=27&gp=0.jpg",
     nickname: "Nick-member",
     created_at: Fri, 19 Jan 2018 00:26:16 CST +08:00,
     updated_at: Fri, 19 Jan 2018 00:26:16 CST +08:00>
    2.4.2 (main):0 > user.avatar
    SystemStackError: stack level too deep
    from /Users/dubing/workspace/vcooline/group_buying_front/app/models/user.rb:18:in `avatar'
    2.4.2 (main):0 >