代码高亮一下会不会好点

感觉不用删吧，还是有不同地方的，留着吧。貌似有人评论过的帖子就不能被删除了。

If you need to check for the presence of a certain local variable in a partial, you need to do it by checking the local_assigns hash that is part of every template. Using defined? variable won’t work due to limitations of the rendering system.

-iflocal_assigns.has_key?:special
  = special

辛苦辛苦，不过有篇相似度很高的文章，https://ruby-china.org/topics/26890。

#11 楼 @adamshen 😓惭愧

#8 楼 @rei 厉害，他这个问题我看了半天没眉目，只是感觉把 nav 标签放到 head 里很奇怪，没想到会是这样。还是你们这些前辈有经验。:plus1:

:plus1: 不错

看看你的代码里是否这样的代码 $(document).on "page:load", ->，其中的page:load每次因 Turbolinks引起的切换页面都会执行里面的逻辑。我猜想你需要的是这样的代码 $(document).on "ready", ->，这个只在第一次加载后 dom ready 才执行，后面因 Turbolinks引起的切换页面都不会再执行了。

#16 楼 @torubylist 你要找的话也该是看 Ruby 的 API，而非 Rails 的。

#18 楼 @torubylist 我用的是 Dash

#3 楼 @davidwei 有插件推荐吗？用 puts 是我一般先打印一行 "--------------------"，然后接着打印自己要看的东西，另外用 asome print 打印的是彩色的，很好辨识的。

#1 楼 @xiaoronglv :plus1: @hgyxbll，要是你懒得引入 pry 的话，最原始的办法就是在怀疑有问题的地方 puts，另外如果用 Rubymine 这类的 IDE 的话，直接 debug 方式运行测试吧。

@runup 感觉你把问题弄复杂了，本来 ltotal 就是用于递增接收总行数的，你又引入一个变量 l ，他们干的事情没法不同。

#7 楼 @runup 感觉还没到 C 语言那一块，更多的是其实现细节这些吧

#8 楼 @adamshen 默认有 scope，你自己再弄一个，基于啥考虑？

#6 楼 @blueplanet :plus1:

老熟人了，顶一个。

#2 楼 @bright +1

:plus1:

#17 楼 @springwq @helperhaps 的方案也可以，不过有个问题是 form 不能嵌套，也就是说你的手机号字段要么放到最前面，要么放在最后面。

#4 楼 赞同 @huacnlee 的说法。参考：

The Active Record connection adapters, classes that implement behavior specific to databases, fetch results as strings and Rails takes care of converting them to other datatypes if necessary, based on the type of the database column. For instance, integer types are cast to instances of Ruby’s Fixnum class, and so on. Even if you’re working with a new instance of an Active Record object, and have passed in constructor values as strings, they will be typecast to their proper type when you try to access those values as attributes. Sometimes you want to be able to read (or manipulate) the raw attribute data without having the column determined typecast run its course first, and that can be done by using the attribute_before_type_cast accessors that are automatically created in your model.

#7 楼 @springwq 你这里肯定就不能这样写了，把<%= link_to send_sms_users_path, method: :get, id:"send_sms",remote: true do %> <span id="send_sms">获取验证码</span><% end %> 换成按钮之类的，在 js 里区监听点击事件，然后触发 Ajax 请求。 另外send_sms.js.erb不是你这样用的，它一般用于返回一段简单的 script（太复杂的别这样搞，你会后悔的）给浏览器，浏览器会自动执行。建议还是系统地看书学习一下。

#18 楼 @redemption 补充一点：

As we work toward the end of this book’s coverage of Active Record, you might have noticed that we haven’t really touched on a subject of particular importance to many programmers: foreign-key constraints in the database. That’s mainly because use of foreign-key constraints simply isn’t the Rails way to tackle the problem of relational integrity. To put it mildly, that opinion is controversial and some developers have written off Rails (and its authors) for expressing it. There really isn’t anything stopping you from adding foreign-key constraints to your database tables, although you’d do well to wait until after the bulk of development is done. The exception, of course, is those polymorphic associations, which are probably the most extreme manifestation of the Rails opinion against foreign-key constraints. Unless you’re armed for battle, you might not want to broach that particular subject with your DBA.

---- 摘自《The Rails 4 Way》

#21 楼 @xiaoronglv 咋个感觉该是自己早睡早起一次，给自己 100 的奖励喃。

暂不清楚你send_sms.js.erb这里是做啥用的，不过参考 jQuery 代码如下：

$.post 'send_sms_users_path',
       data: { phone_number: $("#phone_number").val() }

可以看出 module_function 和 private 都是 Module 类的实例方法。但是：

Module.methods.grep /^priva/
=> [:private_instance_methods,
 :private_constant,
 :private_method_defined?,
 :private_class_method,
 :private_methods]

Module.methods.grep /^mod/
=> [:module_exec, :module_eval]

其中原因暂时不知，若知晓，勿忘告知。

不得不说你把本来就不好懂的问题，描述得更不好懂了

点获取验证码，用 js 发 Ajax 请求去弄？

#5 楼 @smallx +1，虽感觉早起有点反人性，但晚睡却是我们自己不容易管住自己的表现。

#3 楼 :plus1: @chareice 在空气质量低于 100 的时候坚持跑步，阻止自己晚睡。