What's AJAX? AJAX (Asynchronous Javascript and XML) is a kind of technique that can send HTTP requests and exchange data with a server by Javascript. It's an important and practical technique to enhance the user experience, especially when we want to achieve the effect that updating the partial content and

It's common to see a before_action method that need executing in different controller actions. At the same time, when writing RSpec tests for these actions, it's easily to write down context blocks whose test examples are almost the same, and only a let declaration is different. The code might