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If you input a valid email of the users you created in the system and submit the form. A POST request to http://localhost:3000/users/password will be made. Then a reset password mail as described in the previous section will be sent out. You can find that mail in the terminal running rails server. If you have a gem like letter_opener, you can see that mail shown in your browser.
:omniauthable is a special module in devise but it's also in charge of a very common feature: letting users log in by using a user's session from another website, e.g. Facebook, Google, Twitter, Github, etc. It's kind of delegating authentication work to those big tech companies. Nowadays, most companies follow OAuth's standards to build the authentication workflow (OAuth always means OAuth 2.0 in this article). However, each company may have different dialects when you communicate via OAuth. This module is called :omniauthable because devise has integrated with the gem omniauth, which provides a unified interface to realize the login process via OAuth.
