Rails 4：URL中的点以分隔ID

Question

I use the following line to create a link

link_to_remote 'Delete', :url => mail_path(user_id, mail.id), :confirm => 'Delete?', :method => :delete

This will create a DELETE request in the form of /mail/4.3 The route is

delete 'mail/:user_id/:id', to: 'mail#destroy'

I'm trying to access the two IDs in my controller with

@mail = Mail.find(params[:id])
@user = User.find(params[:user_id])

However, it fails with error

ActionController::RoutingError (No route matches [DELETE] "/mail/4.3")

What am I missing here?

Update 1) Output of "rake routes"

Prefix     Verb      URI Pattern                          Controller#Action
mail       DELETE    /mail/:user_id/:id(.:format)        mail#destroy

Answer 1

The reason it is producing the url /mail/4.3 is because mail_path only takes one parameter, so it takes the second as a format. This is because the mail_path url helper that you're using isn't for the DELETE route that you've posted in your question, but some other route.

The Rails Way would be to have nested resources for mail and user like:

resources :users do
  resources :mail
end

Giving you the route helper user_mail_path(@user, @mail) (or something similar depending on pluralisation of mail) and the URL /users/4/mail/3 .

Alternatively, to continue on your path you'll probably have to name your delete route:

delete 'mail/:user_id/:id', to: 'mail#destroy', as: 'delete_mail'

and use delete_mail_path(user_id, mail.id) in your link.