Custom Error Handling with Rails 4.0

Question

I\'m building a Ruby on Rails api using Ruby 2.0 and Rails 4.0. My app is almost solely a JSON API, so if an error occurs (500, 404), I want to capture that error and return

Answer 1

I used the 404.html from public folder and this is in dev environment.
I actually got the answer from:

• https://stackoverflow.com/posts/20508445/revisions and
• https://coderwall.com/p/w3ghqq

However, I did a little experiment on what pieces of code actually made it work. Here's are the pieces of code that I only added.

config/routes.rb

Rails.application.routes.draw do
    // other routes
    match "*path", to: "application#catch_404", via: :all
end

app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
    def catch_404
        render :file => 'public/404.html', :status => :not_found
    end
end

Will appreciate any comments and clarifications as to why some of the original are are needed. For instance, using this line of code

raise ActionController::RoutingError.new(params[:path])

and this

rescue_from ActionController::RoutingError, :with => :error_render_method

Because rescue_from and raise ActionController::RoutingError seem to be the popular answer from the older Rails versions.