In a Rails app, how can I use a button to run a non-restful controller method? Getting no routes error

Question

In my application I have a link_to helper method:

<%= link_to "Downgrade", :controller => :subscriptions, :action => :downgrade, class: "btn btn-primary", remote: true %> 

In my controller I have this code:

class SubscriptionsController < ApplicationController
  respond_to :js

  def downgrade
    # some code
  end
end

I am getting this error:

No route matches {:action=>"downgrade", :class=>"btn btn-primary", :controller=>"devise/subscriptions"}

Here is my routes.rb code:

Rails.application.routes.draw do
 resources :wikis
 devise_for :users
 resources :users, only: [:update]
 root to: 'welcome#index'
 resources :charges, only: [:new, :create]
end

I know Rails is expecting a route for this but I don't know what route I would use since the method isn't a restful verb. Maybe there is another way without using the link_to which allows me to directly call a controller method from a view? Maybe I need to restructure where things are as well. Any help is appreciated.

Let me know if there is more code you would need to fully assess this situation.

Answer 1

Basic setup

first you need to setup your route in routes.rb

get 'downgrade' => 'subscriptions#downgrade', :as => :downgrade_subscription

This will redirect /downgrade to your subscriptions controller & downgrade action. The as option saves this route into a variable you can call from all your views .

<%= link_to "Downgrade", downgrade_subscriptions_path, class: "btn btn-primary", remote: true %>

Further configuration

You can also nest this route inside your subscription resources like so:

resources :subscriptions do
  get 'downgrade' => 'subscriptions#downgrade', :as => :downgrade_subscription
end

This will create the path /subscriptions/downgrade instead of /downgrade .

The Rails Docs on routing does a great job explaining this in more detail. Definitely check it out!

Answer 2

或者你可以在你的routes.rb上尝试

match '/downgrade_subscription', :to => 'subscriptioni#downgrade', :via => :get