ajh · February 13, 2014 14:26 · Sep 19, 2012 · Sep 19, 2012
diff --git a/Ruby.rb b/Ruby.rb
@@ -40,5 +40,11 @@ def details
 
 # app/controllers/articles_controller.rb
 
-class ::BadTaste < ::StandardError; end
-raise BadTaste, "Clams are grose" if @article.title =~ /vongole/i
+class ArticlesController < ApplicationController
+  def show
+    # ...
+    raise BadTaste, "Clams are grose" if @article.title =~ /vongole/i
+  end
+  # ...
+  class ::BadTaste < ::StandardError; end
+end
diff --git a/Locales.yml b/Locales.yml
@@ -0,0 +1,17 @@
+# config/locales/en.yml
+
+en:
+  exception:
+    show:
+      not_found:
+        title: "Not Found"
+        description: "The page you were looking for does not exists."
+      internal_server_error:
+        title: "Internal Server Error"
+        description: "Sorry, something went wrong while processing your request."
+      bad_request:
+        title: "Bad Request"
+        description: "The server did not understand your request. It may have been malformed."
+        bad_taste:
+          title: "Bad Taste"
+          description: "Sorry, the server thinks you've got a bad taste for food (%{exception_message})."
diff --git a/Ruby.rb b/Ruby.rb
@@ -0,0 +1,44 @@
+# config/environments/development.rb
+
+config.consider_all_requests_local = false # true
+
+# config/application.rb
+
+config.exceptions_app = ->(env) { ExceptionController.action(:show).call(env) }
+config.action_dispatch.rescue_responses["BadTaste"] = :bad_request
+
+# app/controllers/exception_controller.rb
+
+class ExceptionController < ActionController::Base
+  layout 'application'
+
+  def show
+    @exception       = env['action_dispatch.exception']
+    @status_code     = ActionDispatch::ExceptionWrapper.new(env, @exception).status_code
+    @rescue_response = ActionDispatch::ExceptionWrapper.rescue_responses[@exception.class.name]
+
+    respond_to do |format|
+      format.html { render :show, status: @status_code, layout: !request.xhr? }
+      format.xml  { render xml: details, root: "error", status: @status_code }
+      format.json { render json: {error: details}, status: @status_code }
+    end
+  end
+
+  protected
+
+  def details
+    @details ||= {}.tap do |h|
+      I18n.with_options scope: [:exception, :show, @rescue_response], exception_name: @exception.class.name, exception_message: @exception.message do |i18n|
+        h[:name]    = i18n.t "#{@exception.class.name.underscore}.title", default: i18n.t(:title, default: @exception.class.name)
+        h[:message] = i18n.t "#{@exception.class.name.underscore}.description", default: i18n.t(:description, default: @exception.message)
+      end
+    end
+  end
+  helper_method :details
+
+end
+
+# app/controllers/articles_controller.rb
+
+class ::BadTaste < ::StandardError; end
+raise BadTaste, "Clams are grose" if @article.title =~ /vongole/i
diff --git a/Templates.html.erb b/Templates.html.erb
@@ -0,0 +1,7 @@
+<!-- app/views/exception/show.htm.erb -->
+
+<div class="box">
+  <h1><%= details[:name] %></h1>
+  <p><%= details[:message] %></p>
+  <%= link_to "Back to home", root_path %>
+</div>
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