i wont to create simple tabs helper for dynamic tabs creation. Something like form_for rails helper. Here what i have for now (simplified for example ): class Tabs attr_reader :tabs, :type, :subtype, :args def initialize(*args) @tabs = [] @type = args[0] || 'horizontal' @subtype = args[1] || 'basic' @args = args.extract_options! end def ta
我不会创建简单的选项卡帮助动态选项卡创建。 类似于form_for rails helper。 在这里，我现在有什么（例如简化）： class Tabs attr_reader :tabs, :type, :subtype, :args def initialize(*args) @tabs = [] @type = args[0] || 'horizontal' @subtype = args[1] || 'basic' @args = args.extract_options! end def tab(*args, &block) tab ={}
How do I write a loop in ruby so that I can execute a block of code on each file? I'm new to ruby, and I've concluded that the way to do this is a do each loop. The ruby file will be executed from a different directory than the directory I want to loop through. I've tried the Dir.foreach and I couldn't get it to work. As others have said, Dir.foreach is a good option here.
如何在ruby中编写循环以便我可以在每个文件上执行一段代码？ 我对ruby很陌生，我已经断定要做到这一点的方法是每个循环。 ruby文件将从不同于我要循环访问的目录的目录执行。 我已经尝试过Dir.foreach ，但无法启动它。 正如其他人所说， Dir.foreach在这里是一个不错的选择。 但是请注意， Dir.entries和Dir.foreach将始终显示. 和.. （当前和父目录）。 你通常不想在他们身上工作，所以你可以做这样的事情： Dir.fo
What are the behavioural differences between the following two implementations in Ruby of the thrice method? module WithYield def self.thrice 3.times { yield } # yield to the implicit block argument end end module WithProcCall def self.thrice(&block) # & converts implicit block to an explicit, named Proc 3.times { block.call } # invoke Proc#call end end WithYield:
什么是以下两种实现方式之间Ruby中的行为差异thrice方法？ module WithYield def self.thrice 3.times { yield } # yield to the implicit block argument end end module WithProcCall def self.thrice(&block) # & converts implicit block to an explicit, named Proc 3.times { block.call } # invoke Proc#call end end WithYield::thrice { puts "Hello world" } WithProcCall::thrice {
I recently discovered Ruby's blocks and yielding features, and I was wondering: where does this fit in terms of computer science theory? Is it a functional programming technique, or something more specific? Ruby's yield is not an iterator like in C# and Python. yield itself is actually a really simple concept once you understand how blocks work in Ruby. Yes, blocks are a functional
我最近发现了Ruby的块和屈服特征，我想知道：这在计算机科学理论方面适合什么？ 它是一种函数式编程技术，还是更具体的东西？ Ruby的yield不像C＃和Python中的迭代器。 一旦你理解了Ruby中的块如何工作， yield本身实际上是一个非常简单的概念。 是的，块是一种功能性编程功能，即使Ruby不是一种功能正常的语言。 事实上，Ruby使用lambda方法创建块对象，这是从Lisp的语法中借用来创建匿名函数的 - 这就是块的功能。 从
In my app I want to prevent a variable from being blank — eg, a user's name should be something other than spaces and other whitespace. It will work like this: foobar = gets.strip arr = [] if # the string in the variable 'foobar' isn't blank arr.push(foobar) end Rails adds blank? method to class String , so that "".blank? , " ".blank? , and nil.blank? are all tr
在我的应用程序中，我想防止变量变为空白 - 例如，用户的名称应该是空格和其他空格以外的内容。 它会像这样工作： foobar = gets.strip arr = [] if # the string in the variable 'foobar' isn't blank arr.push(foobar) end Rails添加blank? 方法来类String ，这样"".blank? ， " ".blank? 和nil.blank? 都是true 。 Ruby有类似的empty? 方法，但它不同于blank? ，正如我们在下面的例子中可
Rails has a .blank? method that will return true if an Object is empty? or nil?. The actual code for this can be found here. When I try on 1.9.2 to duplicate this by doing: class Object def blank? respond_to?(:empty?) ? empty? : !self end end Calling "".blank? returns true but calling " ".blank? returns false when according to the rails documentation a whites
Rails有一个.blank？ 方法，如果一个Object是空的，它将返回true？ 或无？ 实际的代码可以在这里找到。 当我尝试在1.9.2上重复这个操作时： class Object def blank? respond_to?(:empty?) ? empty? : !self end end 调用“”.blank？ 返回true，但调用“”.blank？ 根据rails文档，空白字符串应该为.blank评估为true时返回false？ 在我查阅我最初写的代码之前： class Object def blank? !!self.empty? |
I don't understand the keywords like attr_reader or property in the following example: class Voiture attr_reader :name attr_writer :name property :id, Serial property :name, String property :completed_at, DateTime end How do they work? How can I create my own? Are they functions, methods? class MyClass mymagickstuff :hello end That are just class methods. In this exampl
在下面的例子中，我不理解像attr_reader或property这样的关键字： class Voiture attr_reader :name attr_writer :name property :id, Serial property :name, String property :completed_at, DateTime end 他们如何工作？ 我如何创建自己的？ 它们是功能还是方法？ class MyClass mymagickstuff :hello end 这只是类方法。 在这个例子中， has_foo向放置字符串的实例添加一个foo方法： module Foo de
I have created folowing simple class: class Test def initialize(a, b) @a = a @b = b end def test puts @a end end IS there a way to replace @a with self ? Everytime I tried to do this I received an error: undefined method `a' The reason I am doing this is because I would like to create a new object with two parameters, and later operate on these parameters like: d = MyOb
我创建了以下简单的类： class Test def initialize(a, b) @a = a @b = b end def test puts @a end end 有没有办法用self替换@a ？ 每次我试图做到这一点，我收到一个错误： undefined method `a' 我这样做的原因是因为我想创建一个带有两个参数的新对象，然后对这些参数进行操作，如： d = MyObject('title', 'Author') d.showAuthor 它可以完成，实际上是为这些类完成的：Array，String，Integer
Recently I've been reading "Practical Object Oriented Design in Ruby", and I noticed one of the best practices was to use accessor methods instead of directly grabbing the @instance_variable . For example: class Foo attr_accessor :bar def initialize(my_argument) @bar = my_argument end # bad # def lorem_ipsum # @bar * 999 # end # good def lorem_ipsum
最近我一直在阅读“面向实践的面向对象的Ruby设计”，并且我注意到其中一个最佳实践是使用访问器方法，而不是直接抓取@instance_variable 。 例如： class Foo attr_accessor :bar def initialize(my_argument) @bar = my_argument end # bad # def lorem_ipsum # @bar * 999 # end # good def lorem_ipsum bar * 999 end end 保持DRY是有意义的，并且在需要在实际获取其值的情况下以某种
I've noticed that created resouce attributes are all blank after executing build_resource at Devise::RegistrationsController create function here is the params object sent: "student"=>{"first_name"=>"George", "last_name"=>"Michle", "company_name"=>"Meri", "work_title"=>"Architect", "address"=>"Moon", "postal_code"=>"23410", "work_phone"=>"", "home_phone"=>
我注意到，在Devise::RegistrationsController创建函数中执行build_resource之后，创建的资源属性都是空白的 这里是发送的params对象： "student"=>{"first_name"=>"George", "last_name"=>"Michle", "company_name"=>"Meri", "work_title"=>"Architect", "address"=>"Moon", "postal_code"=>"23410", "work_phone"=>"", "home_phone"=>"", "mobile_phone"=>"", "fax"=>"", "emai