Rails路由：为路径助手提供默认值 [英] Rails routing: Giving default values for path helpers

问题描述

是否可以通过某种方式为url / path帮助器提供默认值？

Is there some way to provide a default value to the url/path helpers?

我在所有路由中都有一个可选范围：

I have an optional scope wrapping around all of my routes:

#config/routes.rb
Foo::Application.routes.draw do

  scope "(:current_brand)", :constraints => { :current_brand => /(foo)|(bar)/ } do
    # ... all other routes go here
  end

end

我希望用户能够使用以下URL访问网站：

I want users to be able to access the site using these URLs:

/foo/some-place
/bar/some-place
/some-place

为方便起见，我在 ApplicationController 中设置了 @current_brand ：

For convenience, I'm setting up a @current_brand in my ApplicationController:

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  before_filter :set_brand

  def set_brand                                                                 
    if params.has_key?(:current_brand)                                          
      @current_brand = Brand.find_by_slug(params[:current_brand])               
    else                                                                        
      @current_brand = Brand.find_by_slug('blah')
    end
  end

 end

到目前为止，很好，但现在我必须修改所有 * _ path 和 * _ url 调用以包含：current_brand 参数，即使该参数是可选的。 IMO，这真的很丑。

So far so good, but now I must modify all *_path and *_url calls to include the :current_brand parameter, even though it is optional. This is really ugly, IMO.

有什么方法可以使帮助者自动找到 @current_brand ？

Is there some way I can make the path helpers automagically pick up on @current_brand?

还是在 routes.rb 中定义范围的更好方法？

Or perhaps a better way to define the scope in routes.rb?

推荐答案

我认为您会想要执行以下操作：

I think you will want to do something like this:

class ApplicationController < ActionController::Base

  def url_options
    { :current_brand => @current_brand }.merge(super)
  end

end

每次构造url并将其结果合并到参数中时，都会自动调用此方法。

This method is called automatically every time url is constructed and it's result is merged into the parameters.

有关此的更多信息，请参见： default_url_options和rails 3

For more info on this, look at: default_url_options and rails 3

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