Rails 5 beta-1 was recently released and one of the notable change was introduction of ApplicationRecord. Up to Rails 4.2, all models inherited from ActiveRecord::Base. But starting from Rails 5, all models will inherit from ApplicationRecord.
![ApplicationRecord in Rails 5](https://cdn-ak-scissors.b.st-hatena.com/image/square/df7dcf3e382d2d4b018ba79fc6642260e3fa7070/height=288;version=1;width=512/https%3A%2F%2Fres.cloudinary.com%2Fdpc4i4bdx%2Fimage%2Fupload%2Fbigbinary_blogs%2Fdefault_blog_image.png)
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