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Test Driven Development, or...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
Adding user avatars is pretty easy using Rails' ActiveStorage feature. We'll be using Devise in this example, but this applies to any user authentication system.
Add masquerading (the ability to impersonate or login as another user) to your development or admin environments using the devise_masquerade gem
Learn how to use Omniauth And omniauth-twitter to let your users authorize and connect to the Twitter API using their Twitter account with your Rails app
A look into user accounts, registration, login, forgot your password, and more
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