Add custom 404 & 500 pages

Author: adrien1018

app/controllers/errors_controller.rb

@@ -0,0 +1,15 @@
+class ErrorsController < ApplicationController
+  def not_found
+    respond_to do |format|
+      format.html { render status: 404 }
+      format.json { render json: {'message': "This page does not exist."} }
+    end
+  end
+
+  def internal_server_error
+    respond_to do |format|
+      format.html { render status: 500 }
+      format.json { render json: {'message': "An unexpected error has occurred. We have received the error report and will be addressing it promptly."} }
+    end
+  end
+end

app/views/errors/internal_server_error.html.erb

@@ -0,0 +1,3 @@
+<% alert_tag class: 'alert-danger' do %>
+  <strong>Oh No! </strong> An unexpected error has occurred. We have received the error report and will be addressing it promptly.
+<% end %>

app/views/errors/not_found.html.erb

@@ -0,0 +1,3 @@
+<% alert_tag class: 'alert-danger' do %>
+  <strong>Oh No! </strong> This page does not exist.
+<% end %>

config/application.rb

@@ -13,6 +13,7 @@ class Application < Rails::Application
     config.load_defaults 7.0
     config.time_zone = "Taipei"
     config.site_name = "TIOJ INFOR Online Judge"
+    config.exceptions_app = self.routes
     begin
       config.x.settings = config_for(:settings)
       if !config.x.settings

config/routes.rb

@@ -130,5 +130,9 @@
   # You can have the root of your site routed with "root"
   root 'welcome#index'
 
+  # Custom error pages
+  match '/404', to: 'errors#not_found', via: :all
+  match '/500', to: 'errors#internal_server_error', via: :all
+
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end