class A def a puts 'in #a' end end class B < A def a b() end def b # here i want to call A#a. end end class B < A alias :super_a :a def a b() end def b super_a() end end There's no nice way to do it, but you can do A.instance_method(:a).bind(self).call , which will work, but is ugly. You could even define your own method in Object to a
class A def a puts 'in #a' end end class B < A def a b() end def b # here i want to call A#a. end end class B < A alias :super_a :a def a b() end def b super_a() end end 没有很好的方法去做，但你可以做A.instance_method(:a).bind(self).call ，它可以工作，但很丑。 你甚至可以在Object中定义你自己的方法来像java中的super一样工作： class SuperProx
In Ruby some methods have a question mark ( ? ) that ask a question like include? that ask if the object in question is included, this then returns a true/false. But why do some methods have exclamation marks ( ! ) where others don't? What does it mean? In general, methods that end in ! indicate that the method will modify the object it's called on . Ruby calls these as " da
在Ruby中，有些方法有一个问号（ ? ），提出一个像include?这样的问题include? 询问是否包含所讨论的对象，然后返回true / false。 但为什么有些方法在其他人不知道的地方有惊叹号（ ! ）？ 这是什么意思？ 一般来说，以!结尾的方法! 表明该方法将修改它所调用的对象 。 Ruby把这些称为“ 危险的方法 ”，因为它们改变了别人可能参考的状态。 这是一个简单的字符串示例： foo = "A STRING" # a string called foo foo.d
Background: I have a module which declares a number of instance methods module UsefulThings def get_file; ... def delete_file; ... def format_text(x); ... end And I want to call some of these methods from within a class. How you normally do this in ruby is like this: class UsefulWorker include UsefulThings def do_work format_text("abc") ... end end Problem include U
背景： 我有一个模块，它声明了许多实例方法 module UsefulThings def get_file; ... def delete_file; ... def format_text(x); ... end 我想从一个班级中调用其中的一些方法。 你通常如何在ruby中这样做是这样的： class UsefulWorker include UsefulThings def do_work format_text("abc") ... end end 问题 include UsefulThings带来所有从方法UsefulThings 。 在这种情况下，我只需要forma
Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language. Try to limit this discussion with core Ruby, without any Ruby on Rails stuff. See also: Hidden features of C# Hidden features of Java Hidden features of JavaScript Hidden features of Ruby on Rails Hidden features of Python (Please, just one hid
继续“隐藏的...特性”，让我们分享Ruby编程语言鲜为人知的但有用的特性。 试着限制这个讨论与核心Ruby，没有任何Ruby on Rails的东西。 也可以看看： C＃隐藏的功能 Java的隐藏功能 JavaScript的隐藏功能 Ruby on Rails的隐藏功能 Python的隐藏功能 （请每个答案只有一个隐藏功能。） 谢谢 从Ruby 1.9 Proc＃===是Proc＃调用的别名，这意味着Proc对象可以在case语句中使用，如下所示： def multiple_of(factor)
I'm trying to install the curb gem on my Debian machine but I'm having a hard time building the gem with native extensions. I'm using RVM. Just a list of things I'm using: debian bundler rvm ruby-1.9.2-p180 curb I'm told I have to install the following packages and I've done so: sudo apt-get install libcurl3 libcurl3-gnutls libcurl4-openssl-dev When I go
我试图在我的Debian机器上安装遏制宝石，但我很难用本机扩展来构建宝石。 我正在使用RVM。 只是我正在使用的东西的列表： Debian的 捆绑 RVM 红宝石1.9.2-P180 抑制 我被告知我必须安装下列软件包，我已经这样做了： sudo apt-get install libcurl3 libcurl3-gnutls libcurl4-openssl-dev 当我继续这样做时： 宝石安装路边 Building native extensions. This could take a while... ERROR: Error install
I'm parsing something like this: 11/23/10 23:29:57 which has no time zone associated with it, but I know it's in the UTC time zone (while I'm not). How can I get Ruby to parse this as if it were in the UTC timezone? 在解析它之前，您可以将UTC时区名称追加到字符串中： require 'time' s = "11/23/10 23:29:57" Time.parse(s) # => Tue Nov 23 23:29:57 -0800 2010 s += " UTC" Time.parse(s)
我正在解析这样的事情： 11/23/10 23:29:57 它没有与它关联的时区，但我知道它在UTC时区（而我不是）。 我怎样才能让Ruby把它解析成好像它在UTC时区？ 在解析它之前，您可以将UTC时区名称追加到字符串中： require 'time' s = "11/23/10 23:29:57" Time.parse(s) # => Tue Nov 23 23:29:57 -0800 2010 s += " UTC" Time.parse(s) # => Tue Nov 23 23:29:57 UTC 2010 如果您使用Rails，则可以使用ActiveSupport::TimeZ
I don't manage to install therubyracer gem on Yosemite 10.10. Here is the log: 11:53 $ gem install libv8 -v '3.16.14.3' -- --with-system-v8 Building native extensions with: '--with-system-v8' This could take a while... Successfully installed libv8-3.16.14.3 Parsing documentation for libv8-3.16.14.3 Installing ri documentation for libv8-3.16.14.3 Done installing documentation for libv8
我无法在优胜美地10.10上安装therubyracer gem。 这里是日志： 11:53 $ gem install libv8 -v '3.16.14.3' -- --with-system-v8 Building native extensions with: '--with-system-v8' This could take a while... Successfully installed libv8-3.16.14.3 Parsing documentation for libv8-3.16.14.3 Installing ri documentation for libv8-3.16.14.3 Done installing documentation for libv8 after 0 seconds 1 gem in
I am attempting to write a function which tries to connect to Redis using default TCP settings, and if that fails, tries to connect to Redis through a unix socket. My intent is to have a single connection script that works on all my systems, some of which use TCP and others which use sockets. However, I can't seem to rescue from the failed TCP connection. Here is my test script. require
我试图编写一个函数，它尝试使用默认TCP设置连接到Redis，如果失败，则尝试通过unix套接字连接到Redis。 我的意图是在我的所有系统上都有一个连接脚本，其中一些使用TCP和其他使用套接字的连接脚本。 但是，我似乎无法从失败的TCP连接中解救出来。 这是我的测试脚本。 require "redis" def r begin $redis ||= Redis.new rescue $redis = Redis.new(:path => "/tmp/redis.sock") end end puts "You have
I want to reuse some Cucumber steps but can't seem to find the right way. I want to write a step like: Given /^I login with (.*) credentials$/ |type| # do stuff with type being one of "invalid" or "valid" end But then have another step like: Given /^I login successfully$ # call "Given I login with valid credentials" end So in testing user authentication I can use the former, but mos
我想重用一些黄瓜步骤，但似乎无法找到正确的方法。 我想写一个像这样的步骤： Given /^I login with (.*) credentials$/ |type| # do stuff with type being one of "invalid" or "valid" end 但是，接下来会有另一个步骤： Given /^I login successfully$ # call "Given I login with valid credentials" end 所以在测试用户身份验证时我可以使用前者，但大多数其他地方，我可以使用后者，而实际上并不需要重新编码
I ve downloading cookbooks from object storage which has link https, require 'open-uri' open("/home/admini/Desktop/apache2.tgz","wb") do |write_file| open("https://region-a.geo-1.objects.hpcloudsvc.com:443/v1/68342917034742/cookbooks/marketplace/production/apache2.tar","rb") do |read_file| write_file.write(read_file.read) end end it gets downl
我已经从具有链接https的对象存储下载食谱， 需要'open-uri'打开（“/ home / admini / Desktop / apache2.tgz”，“wb”）do | write_file | 打开（“https://region-a.geo-1.objects.hpcloudsvc.com:443/v1/68342917034742/cookbooks/marketplace/production/apache2.tar”，“rb”）do | read_file | write_file.write（read_file.read）结束 它为某些提供商获得下载，但对于某些提供商而言，它无法获得下载，如下所示