{"id":8290,"date":"2016-05-28T12:34:05","date_gmt":"2016-05-28T12:34:05","guid":{"rendered":"https:\/\/dev.railscarma.com\/a-detailed-look-rails-5-features-changes\/"},"modified":"2021-06-06T12:26:59","modified_gmt":"2021-06-06T12:26:59","slug":"a-detailed-look-rails-5-features-changes","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/it\/blog\/articoli-tecnici\/a-detailed-look-rails-5-features-changes\/","title":{"rendered":"Uno sguardo dettagliato alle caratteristiche e alle modifiche di Rails 5"},"content":{"rendered":"
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\n\t\t\t\t\t\t\t\t\tRails 5 was announced by David Heinemeier Hansson(DHH), creator of Ruby on Rails Framework at RailsConf 2015 in Atlanta. Ruby 5.0.0 Beta version was released on 18th December 2015. Apart from the Rails 4, the new features are implemented in 5 version such as Action cable and improved turbolinks that can instantly improve the web development workflow. Here are the\u00a0Rails 5 Features :\n

Ruby Version Support :<\/h3>\nRails 5 will only<\/strong> work on Ruby 2.2.1 and above. The following features are the reasons for using ruby 2 or higher :\n\nSymbol Garbage Collector<\/strong>\n\nIn Ruby On Rails applications, we usually pass symbols all over the place, doing this opens the possibility of DoS attacks when our memory is consumed by symbols that never get garbage collected. Ruby 2.2.0 introduced changes in its garbage collector to be able to collect symbols.\n\nModule #prepend<\/strong>\n\nAllows to do insert a module in-front of the class it was prepended.\n\nKeyword Arguments<\/strong>\n\nRuby 2.0 introduced first-class support for keyword arguments:\n
def foo(bar: ‘default’)\nputs bar\nend\n\nfoo # => ‘default’\nfoo(bar: ‘baz’) # => ‘baz’\nIncremental GC<\/blockquote>\nThis will help to reduce memory consumption by Rails applications.\u00a0Deprecated code removed and Cleanup\n\nAction Mailer<\/strong>\n\n#deliver and #deliver! methods have been removed, use new methods deliver_now or deliver_later.\n
*_path helper in email views has been removed and use *_url.<\/blockquote>\nRegistrazione attiva<\/strong>\n\nProtected attributes(attr_accessible) completely unsupported now.\n\nUnsupport for activerecord-deprecated_finders gem.\n\nActionPack Assertions<\/strong>\n\nassert_template and assigns() assertions are deprecated and moved into its own gem rails-controller-testing.\n
ActiveRecord::Base#has_secure_token<\/blockquote>\nRails 5 has introduced has_secure_token to include random token in models.\n\nAction View<\/strong>\n\nIn action view, helper methods such as content_tag_for and div_for were removed from the core and moved out to a separate gem record-tag-helper.\n\nTurbolinks<\/strong>\n\nNew Turbolinks 3<\/strong> solves one of the major problems of Rails. Few web apps works really slow cause it reloads the full page from server. This new Turbolinks 3 reloads only the contents of the body, it doesn’t reloads the whole page. It allows you to specify which elements to replace through partials.\n\nPartial replacement feature, is the one of the most significant change in Rails 5. We will be able tell Turbolinks from client side that what content do we need to change\/replace and what we don’t. To decide the replacement strategy in DOM, turbolinks will look for HTML5 custom attributes data-turbolinks-permanent and data-turbolinks-temporary.\n\nWe can use turbolinks.visit or Turbolinks.replace to update DOM and to trigger a replacement in the client side. Visit will issue a GET to the server to obtain the HTML that must be used to replace our DOM and replace expects from us the HTML that should be used for its operation.\n\nThe same functionalities can be triggered from the server-side with redirect_to and render, both redirect_to and render can receive change, keep and flush as options. But redirect_to can also receive turbolinks with true or false to force a redirect.<\/em>\n\nCavo d'azione<\/strong>\n\nCavo d'azione<\/strong> is a framework, used to extend Rails via Websockets to add real-time message passing functionality. This is probably one of the best things in Rails 5. It smoothly integrates WebSockets with the rest of Rails application. Action cable makes it very easy to add realtime features to your app. The reason behind adding this feature was increasing need for such feature. It was introduced to extend Rails functionality with real time messaging utilizing WebSockets.\n\nAction Cable offers a lot of advantages including being an open connection, extremely lightweight compared to other HTTP request. Another advantage is that once a connection made, it will remain open. Through that open line, both server and the client can communicate without reestablishing a new connection. The server and the client can use full-duplex connection of WebSocket to communicate to each other at the same time.\n\nOne disadvantage of Action Cable is its inability to cache requests. Another con of WebSocket is the support among browsers as only 70% of the browser market allows for WebSocket connections.<\/em>\n\nAdditional New Features in Rails 5<\/strong>\n