Question

I am trying to make a POST request to /api/kpi?data=some+stuff:

curl -i http://127.0.0.1:9010/api/create_kpi -F data="some stuff" 

but I’m getting a 404.

My routes are:

# config/routes.rb

namespace :api do
  resource :kpi,  :except => [:edit, :destroy]
end

Which should hit my controller

# app/controllers/api/kpi_controller.rb

class Api::KpiController < ApplicationController
  def create
    temp = Kpi.new(params[:data])
  end
end

So I am guessing the paths are not correct. Right? I am having a hard time understanding whether my route is incorrect, or the controller, or the call.

Answer 1

When you get a 404, check your routes. It usually means there is no route to the controller to reach. Routes are what makes the link between URLs and controllers. If your controller was getting hit, it’d either work or give you a runtime error.

1. Inspect your routes by running rake routes. It’s a very helpful tool. It should give you something like this:

       users GET    /users(.:format)          users#index
             POST   /users(.:format)          users#create
    new_user GET    /users/new(.:format)      users#new
   edit_user GET    /users/:id/edit(.:format) users#edit
   

   You can see that it gives you the mapping of what [method, URL] request will hit which [controller, action]. For example, here, POST /users will trigger action create of UsersController.

2. Given a controller/resource name, Rails will, by convention, go looking for the plural of that name. For example, given resources :user, Rails will go looking for UsersController in file app/controllers/users_controller.rb. (Path/file names have to match the name!)

   @yfedblum talks about the use of singular and plural in Rails into more detail.