ruby on rails-不存在的路线

Question

I have a controller file,

abc_controller.rb. 

I have defined the show method inside it.

I have a view file,

show.html.haml

inside app/views/abc/

In my routes.rb file, I am giving the following command

resources :abc

I have a button

= link_to 'abc', abc_path, class: 'btn btn-default'

But when I click on the button, its not going to the new page.

I am getting non-existent route error. Since I am a newbie to rails, I am not able to figure what the problem is.

Answer 1

If you do resources (plural) the resulting route for show requires an id: /abc/:id(.:format) , so abc_path requires that you pass that :id or a object. If you are dealing with a singular abc ( resource :abc ), the resulting path doesn't require that :id, so you code should work (this is less common, but hard to tell with your "abc" example.

Answer 2

You are getting a error because there is no such path as abc_path . Run rake routes and you'll see the routes that Rails understands. In you example, resources :abc produces the following routes.

abc_index GET      /abc(.:format)            abc#index
          POST     /abc(.:format)            abc#create
  new_abc GET      /abc/new(.:format)        abc#new
 edit_abc GET      /abc/:id/edit(.:format)   abc#edit
      abc GET      /abc/:id(.:format)        abc#show
          PATCH    /abc/:id(.:format)        abc#update
          PUT      /abc/:id(.:format)        abc#update
          DELETE   /abc/:id(.:format)        abc#destroy

The first column are the named routes. So in order to get to the index action of abc_controller , the route is named abc_index_path . There is an abc_path but it needs an id params which means that you need to pass something to it. In your case, there's no definitive value to pass to this method so as a trial just use abc_path(1) which will redirect you to /abc/1 . This goes to the show action with params[:id] set to 1 .