How to add 404 error page in ruby on rails app?

Question

Can you help me in this. I want to add 404 error page to my website. I tried many ways but nothing works for me. Here is one of them.

ApplicationController

unless  ActionController::Base.consider_all_requests_local
  rescue_from Exception, :with => :render_404
end

private

  def render_404
    render :template => 'error_pages/404', :layout => false, :status => :not_found
  end

Then set up error_pages/404.html

Can anyone fix this?

Don't rescue Exception, it's evil. Rescue StandardError if you have to. And BTW could you be a little bit more specific? What does it mean it 'didn't work'? — Marek Lipka
– Marek Lipka, Commented Dec 20, 2018 at 12:51
Thank you for this. Do you have any other way? I want when anyone type anything after the url that doesn't have in the route to bring 404 html page — nourza
– nourza, Commented Dec 20, 2018 at 13:12
Rails by default call 404.html from public folder, you can also define 404 to an custom controller by adding match '404', to: 'custom_errors#not_found', via: :all in routes.rb and config.exceptions_app = routes in application.rb — d1ceward
– d1ceward, Commented Dec 20, 2018 at 13:13
Can you put this in the answer section but with more explanation please — nourza
– nourza, Commented Dec 20, 2018 at 13:15
Here is a video for the solution youtube.com/watch?v=OWGCiHDP-u4&t=144s — nourza
– nourza, Commented Dec 21, 2018 at 21:35

Vasfed · Accepted Answer · 2018-12-20 15:05:27Z

Rescuing 404 (usually originating from ActiveRecord::RecordNotFound) from your controller will not always help, because there're also routing errors (ActionController::RoutingError)

To present exceptions to user rails calls config.exceptions_app, which defaults to ActionDispatch::PublicExceptions.new(Rails.public_path) and just renders public/404.html etc.

For most cases it's enough to place your error pages there, but if you absolutely must render something dynamic - you can override the exceptions app.

One common hack is to route exceptions back into your main routes via config.exceptions_app = self.routes and adding regular routes to handle them:

get '/404', to: 'errors#not_found'
get '/422', to: 'errors#unacceptable'
get '/500', to: 'errors#server_error'

But beware, that if there's already an exception - you may get an exception loop, so it's better to have separate error handling app/engine

Ryan · Accepted Answer · 2020-04-27 22:33:47Z

1

If you are simply wanting custom static error pages, you can change the HTML inside of public/404.html, public/422.html and public/500.html.

answered Apr 27, 2020 at 22:33

Ryan

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