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In this tutorial, we will learn how to add the device gem for authenticating users with an existing user model in a Rails project. By adding the device gem, we can authenticate users into our Rails application. To do this, we need to specify the resource model that we want to authenticate, in this case, our existing user model. Start by opening the project directory in a text editor, switch to the Gemfile, and add the device gem. Save the Gemfile, switch to the terminal, and run 'bundle install' to install the gem. After that, generate the device initializer using the command 'rails generate devise:install'. This will allow us to authenticate users using the device gem.
