Add error routes

Author: lsegal

app/controllers/errors_controller.rb

@@ -0,0 +1,15 @@
+class ErrorsController < ApplicationController
+  VALID_STATUS_CODES = %w[400 404 406 422 500].freeze
+
+  def self.constraints
+    { code: Regexp.new(VALID_STATUS_CODES.join("|")) }
+  end
+
+  def show
+    status_code = VALID_STATUS_CODES.include?(params[:code]) ? params[:code] : 500
+    respond_to do |format|
+      format.html { render status: status_code }
+      format.any { head status_code }
+    end
+  end
+end

app/views/errors/show.html.erb

@@ -0,0 +1,19 @@
+<div id="content" class="scm fof">
+  <h1>Oops,</h1>
+  <% case response.code.to_i %>
+  <% when 404 %>
+    <h2 class="nomargin">The page could not be found.</h2>
+    <p>
+      Sorry, but we couldn't find the page <strong><%= h URI(request.original_url).path %></strong>.
+      Are you sure that page?
+    </p>
+  <% else %>
+    <h2 class="nomargin">An unexpected error occurred.</h2>
+    <p>
+      Sorry, but an unexpected error occurred while processing your request.
+      Please try again later or contact support using the Help link above.
+    </p>
+  <% end %>
+</h2>
+<%= link_to "Go back home", root_path %>
+</div>

app/views/layouts/_meta.html.erb

@@ -6,9 +6,11 @@
 <% else %>
   <meta name="robots" content="index, follow">
 <% end %>
-<link rel="canonical" href="<%= request.original_url %>">
-<meta property="og:title" content="<%= h page_title %>">
-<meta property="og:description" content="<%= h page_description %>">
-<meta property="og:image" content="<%= URI(request.original_url).tap { it.path = "/favicon.ico" }.to_s %>">
-<meta property="og:url" content="<%= request.original_url %>">
-<meta property="og:type" content="website">
+<% if controller_name != "errors" %>
+  <link rel="canonical" href="<%= request.original_url %>">
+  <meta property="og:title" content="<%= h page_title %>">
+  <meta property="og:description" content="<%= h page_description %>">
+  <meta property="og:image" content="<%= URI(request.original_url).tap { it.path = "/favicon.ico" }.to_s %>">
+  <meta property="og:url" content="<%= request.original_url %>">
+  <meta property="og:type" content="website">
+<% end %>

config/application.rb

@@ -38,5 +38,6 @@ class Application < Rails::Application
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
     config.session_store :disabled
+    config.exceptions_app = routes
   end
 end

config/routes.rb

@@ -13,6 +13,7 @@
   # root "posts#index"
 
   root "github#index"
+  match "/:code", to: "errors#show", via: :all, constraints: ErrorsController.constraints
 
   get "/about", to: "about#index", as: :about
   get "/help", to: "help#index", as: :help