Question

我正在将一个Merb应用程序移植到Rails 3.在Merb中，我们可以在路径周围放置一个Identify块来定义如何提供：id路由参数，例如，

# this is a Merb route that I want to port to Rails 3 routing; I get everything except 
# how to replicate the behavior of Merb's Identify block which doesn't require one to 
# futz with overriding to_param on user; a user instance gets passed to the url builder
# ala url(:edit_password_reset, user) and this tells the router to use the 
# reset_password_token method on user to supply the :id value for this one route
Identify User => :reset_password_token do
  match("/reset-password/:id", :method => :get).to(:controller => "password_resets", :action => "edit").name(:edit_password_reset)
end

# and then later define more routes that use the user's id without a problem 
# since to_param was not overridden on user; here I have already translated to 
# Rails 3 and this works fine
controller :users  do
  get "/register", :action => "new", :as => "new_user"
  get "/users", :action => "index", :as => "users"
  get "/users/:id", :action => "show", :as => "show_user"
  get "/users/:id/edit", :action => "edit", :as => "edit_user"
  put "/users/:id", :action => "update", :as => "update_user"
  post  "/users", :action => "create", :as => "create_user"
end

在Rails中，与Merb一样，您可以覆盖to_param以为路由提供替代id值，但是对于一次要使用id而另一次要在同一对象上使用不同方法的情况（如上所述），识别很方便。什么是Rails 3等价物？我查看了Rails 3源代码并进行了测试，没有发现任何与Identify相同的内容。我错过了吗？

我可以重构一些事情，也许在这种情况下不需要它，但我仍然想知道我是否错过了什么。

感谢。

Answer 1

我遇到了同样的问题;事实证明，最好的方法是在调用url或路径时完全跳过to_param。例如：

# This will set params[:id] to @user.to_param
edit_password_reset_url(@user)

# This will set params[:id] to @user.reset_password_token
edit_password_reset_url(@user.reset_password_token)

换句话说，只有在将记录传递给url助手时才会调用to_param;如果你传递一个字符串，它只会解析字符串。

定义：路由中的id不是rails 3中的id

1 个答案: