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Mocks are a handy tool for ...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
Learn how to use the new Encrypted credentials in Rails 5.2 as a replacement to the old secrets.yml and encrypted secrets.
Easily add file uploads to any model (including single or multiple files) using Rails 5.2's new ActiveStorage feature
Rails 5.2's adds CurrentAttributes to give you access to global variables in your apps. We'll use this feature to implement a Rack middleware to build Basecamp 3 style URLs that automatically include the current Account ID in every URL
Learn how to create a file previewer with Active Storage in Rails 5.2+ to generate preview images of application files. In this example, we'll be converting Powerpoint presentations to png image previews.