变量在 RoR 中未正确回显
我正在按照 Rails 教程 开始（第 4000 次）使用 Ruby on Rails。我几乎是在快速阅读前几章，因为我已经阅读并输入了很多次这些内容，但我刚刚遇到了一个我似乎无法解决的小问题。
在其中一章中，建议我们创建一个辅助函数以使页面标题的显示更加动态。
助手看起来像这样：
module ApplicationHelper
#return title on per page basis
def title
base_title = "Ruby on Rails Tutorial Sample App"
if @title.nil?
base_title
else
"#{base_title} | #{@title}"
end
end
end
我的控制器看起来像这样：
class PagesController < ApplicationController
def home
@title = "Home"
end
# more pages
end
最后，我的应用程序布局文件包含以下行：
<title><%= @title %></title>
书籍说它现在应该“回显”（这是 PHP 行话吗？ Tee-hee）以下标题：
Ruby on Rails 教程示例应用程序 | Home 为主页。但是，它仅呼应“主页”作为页面标题。
我在这里忽略了什么吗？我不认为我输入了任何错误或任何内容；对我来说一切看起来都很合乎逻辑，但它行不通。
多谢！
I'm following the Rails Tutorial to get started (for the 4000th time) with Ruby on Rails. I'm pretty much racing through the first couple of chapters, as I have already read and typed these quite a lot of times but I just ran into a minor problem which I cannot seem to solve.
In one of the chapters, it is suggested that we create a helper function to make the displaying of page titles more dynamic.
The helper looks like this:
module ApplicationHelper
#return title on per page basis
def title
base_title = "Ruby on Rails Tutorial Sample App"
if @title.nil?
base_title
else
"#{base_title} | #{@title}"
end
end
end
My controller looks like this:
class PagesController < ApplicationController
def home
@title = "Home"
end
# more pages
end
And finally, my application layout file contains the following line:
<title><%= @title %></title>
The books says that it should now "echo" (is this PHP lingo? Tee-hee) the following title:
Ruby on Rails Tutorial Sample App | Home for the homepage. However, it only echoes 'Home' as the page title.
Am I overlooking something here? I don't think I typed any errors or anything; everything looks fairly logical to me, however it won't work.
Thanks a lot!
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在您的视图中调用@title 指的是变量，而不是方法。由于变量@title 等于“Home”，这就是您得到的结果。要调用该方法，您应该尝试以下操作：
Calling @title in your view refers to the variable, not the method. As the variable @title is equal to "Home", this is what you get. To call the method, you should try something like :
我认为你从书中抄错了。 （好消息是，您遇到的问题在免费示例章节中。:)
这本书实际上的内容是：
你拥有的是：
使用
@，可以直接查找变量。如果没有@，它将调用方法title()。 （我希望他们在函数调用后面加上()，但那是 Ruby 惯用语。我只是不喜欢 Ruby 习惯用法。）I think you've mis-copied from the book. (Good thing the problem you're having is in the free sample chapter. :)
What the book actually has is:
What you have is:
With the
@, that directly looks up the variable. Without the@, it calls the methodtitle(). (I wish they had put()after the function call, but that is idiomatic Ruby. I just dislike the Ruby idiom.)