如何在Rails 3路由中检测整数？ [英] How to Detect an Integer in Rails 3 Routes?

问题描述

我只想在rotues.rb中做一点额外的逻辑，这也许不属于那里，但是对我来说似乎最有意义。

I would like to do just a little bit of extra logic in rotues.rb, that probably doesn't belong there, but it seems to make the most sense to me.

我有两条相互冲突的路线。简而言之：

I have two conflicting routes. To be primitive:

match '/videos/:browseby' => 'videos#browse', :as => "browse_by"

其中：browseby正在查找字符串，例如标签，以浏览视频

Where :browseby is looking for a string, such as "Tags", to browse videos by tags.

但是，（而且很有可能看到了这种情况）我也有基本的表演资源（同样以原始形式）：

However, (and most probably saw this coming) I also have my basic show resource (again in primitive form):

match '/videos/:id' => 'videos#show', :as => "video"

其中：id正在寻找视频ID的整数。

Where :id is looking for the integer for the video ID.

有没有办法添加一点逻辑，例如...

Is there a way to add a small bit of logic such as...

match '/videos/:id' => 'videos#show', :as => "video", :format(:id) => :integer

（这是我假设的rails语法，以帮助显示我在寻找什么。）

(Which is my hypothetical rails syntax, to help show what I'm looking for.)

我知道我可以在Controller级别进行修改，但是在路由级别处理它对我来说更有意义。

I know I can munch this in the Controller level, but it makes more sense to me to handle it at the route level.

推荐答案

您可以尝试使用：constraints 和正则表达式：

You could try using :constraints and a regex:

match '/videos/:id' => 'videos#show', :as => "video", :constraints => { :id => /\d/ }
match '/videos/:browseby' => 'videos#browse', :as => "browse_by"

您还需要确保宽松的：browseby 版本在：id 版本之后。请注意，正则表达式约束是在开始时隐式锚定的，因此只要您的：browseby 值不是以数字开头。

You'll also want to make sure the looser :browseby version comes after the :id version. Note that regex constraints are implicitly anchored at the beginning so that would work as long as your :browseby values didn't start with a number.

如果您有以数字开头的标签，则您可以使用对象作为约束，然后可以在正则表达式中包含锚：

If you have tags that do start with numbers then you could use an object for the constraint and then you could include anchors in your regex:

class VideoIdsOnly
    def matches?(request)
        request.path =~ %r{\A/videos/\d+\z}
    end
end

match '/videos/:id' => 'video#show', :as => "video", :constraints => VideoIdsOnly.new
match '/videos/:browseby' => 'videos#browse', :as => "browse_by"

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