Rails-动作和http动词必须匹配吗？

Question

A custom action export_file is defined in routes.rb:

   resource :payment_requests do
      collection do
        get :export_file
      end
   end

In a form_tag , can we use method: put for export_file even though the export_file is a get ?

<%= form_tag export_file_payment_requests_path(format: 'csv'), method: :put do %>
   ......
  <%= submit_tag 'CSV' %>
<% end %>

It seems OK to use put method for get action according to http document.

Answer 1

Essentially, yes that's fine - you absolutely can send a PUT request from a form in Rails.

However, if you specify a route in your routes.rb file as being a get request, it will only ever match it using the HTTP GET verb.

Take a look at the output from rake routes :

               Prefix Verb     URI Pattern                                                                  Controller#Action
 api_v1_search_simple GET      /api/v1/search/simple(.:format)                                              api/v1/search#simple
     new_user_session GET      /auth/login(.:format)                                                        devise/sessions#new
         user_session POST     /auth/login(.:format)                                                        devise/sessions#create
 destroy_user_session DELETE   /auth/logout(.:format)                                                       devise/sessions#destroy
        user_password POST     /auth/password(.:format)                                                     devise/passwords#create
    new_user_password GET      /auth/password/new(.:format)                                                 devise/passwords#new
   edit_user_password GET      /auth/password/edit(.:format)                                                devise/passwords#edit
                      PATCH    /auth/password(.:format)                                                     devise/passwords#update
                      PUT      /auth/password(.:format)                                                     devise/passwords#update
    user_confirmation POST     /auth/confirmation(.:format)                                                 devise/confirmations#create
new_user_confirmation GET      /auth/confirmation/new(.:format)                                             devise/confirmations#new
                      GET      /auth/confirmation(.:format)                                                 devise/confirmations#show
                 root GET      /                                                                            dashboards#show

You see how it lists the Verb it will match against?

If you want to send a PUT request and have rails match it against a particular controller and action, then you should specify it as a put request in your routes.rb file.

You do have the option of using the match wildcard to define a route, but that is generally considered a bad thing to do, since it opens up your application for misuse.

This guide is really useful: http://guides.rubyonrails.org/routing.html

If you read section 3.7 , you'll see that you can use the match keyword along with the via attribute to restrict what verbs your route should match against. Such as this:

match 'photos', to: 'photos#show', via: [:get, :post]

You could use a route like that to match against both GET and PUT if you need it.