Rails 3 - development errors in production mode

Question

Im using Rails, Passenger (both are 3.0.5) and Nginx on my production server. As I heard, Rails should show public/404.html or public/500.html instead of development errors like ActiveRecord::RecordNotFound or Unknown action but that doesn't happen. I've tried to delete config.ru file and set rack_env or rails_env in nginx.conf but nothing helped.

Here is my nginx.conf:

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    passenger_root /home/makk/.rvm/gems/ruby-1.9.2-p0/gems/passenger-3.0.5;
    passenger_ruby /home/makk/.rvm/bin/passenger_ruby;
    #passenger_ruby /home/makk/.rvm/wrappers/ruby-1.9.2-p0/ruby;

    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;

        location / {
            root   /home/makk/projects/1server/deploy/current/public;
            index  index.html index.htm;
            passenger_enabled on;
            rack_env production;

            recursive_error_pages on;

            if (-f /home/makk/projects/1server/maintenance.html) {
              return 503;
            }

            error_page 404 /404.html;
            error_page 500 502 504 /500.html;
            error_page 503 @503;
        }

        location @503 {
            error_page 405 = /maintenance.html;

            # Serve static assets if found.
              if (-f $request_filename) {
              break;
            }
            rewrite ^(.*)$ /maintenance.html break;
        }

        location ~ ^(\/phpmyadmin\/)(.*)$ {
        fastcgi_pass    127.0.0.1:9000;
        fastcgi_index   index.php;
        fastcgi_split_path_info         ^(\/phpmyadmin\/)(.*)$;
        fastcgi_param   SCRIPT_FILENAME /usr/share/phpmyadmin/$fastcgi_path_info;
        include         fastcgi_params;
        }
    }
}

It seems that this question duplicates this one but there are no working suggestions.

UPD: I have both development and production apps on same PC. In production Rails ignores config.consider_all_requests_local = false (in /config/environments/production.rb) due to local_request? method. So one of possible solutions is listed below (taken from here):

# config/initializers/local_request_override.rb
module CustomRescue
  def local_request?
    return false if Rails.env.production? || Rails.env.staging?
    super
  end
end

ActionController::Base.class_eval do
  include CustomRescue
end

Or for Rails 3:

class ActionDispatch::Request
 def local?
   false
 end
end

Answer 1

To get this working in Rails 3 you'll have to do the following:

First, create your 404 and 500 error pages. I put mine in app/views/errors/404.html.erb and app/views/errors/500.html.erb.

Second, add the following to application_controller.rb:

unless Rails.application.config.consider_all_requests_local
  rescue_from Exception, :with => :render_error
  rescue_from ActiveRecord::RecordNotFound, :with => :render_not_found
  rescue_from AbstractController::ActionNotFound, :with => :render_not_found
  rescue_from ActionController::RoutingError, :with => :render_not_found
  rescue_from ActionController::UnknownController, :with => :render_not_found
  rescue_from ActionController::UnknownAction, :with => :render_not_found
end

def render_error exception
  Rails.logger.error(exception)
  render :template => "/errors/500.haml", :status => 500
end

def render_not_found exception
  Rails.logger.error(exception)
  render :template => "/errors/404.haml", :status => 404
end

Finally, make your production.rb not consider all requests local:

config.consider_all_requests_local = false

P.S: Keep in mind that when a complete routing error happens - i.e when there is absolutely no route match, not just an ActiveRecord NotFound error, the public/404.html will get displayed, so it's good to have that in place. I usually just re-direct it to my errors_controller, which ensures that any 404 errors not caught by the latter mentioned exceptions are still properly redirected to ErrorsController.

<script type="text/javascript">
<!--
window.location = "<%= request.host_with_port %>/errors/404"
//-->
</script>

Answer 2

To get errors only in certain controllers

class AdminController < ApplicationController
  rescue_from Exception, :with => :render_simple_error if Rails.env.production?
  def render_simple_error(e)
    render :text => "#{e.message} -- #{e.class}<br/>#{e.backtrace.join("<br/>")}"
  end
end