Rails OmniAuth using Devise with Twitter, Facebook and Linkedin | Sourcey

There are quite a few OAuth solutions out there, but I want to share the one we use since it allows you to intelligently link multiple OAuth identities with a single user entity. If you use 90% of the code examples on the Internet you will wind up with a new user entity each time the user signs in with a different OAuth provider, and a bunch of very confused users. The OAuth provider that throws a

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“match '/users/:id/finish_signup' => 'users#finish_signup', via: [:get, :patch], :as => :finish_signup”