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Step:1 add the gems in your gemfile
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Step:2 define your root url
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Step:3 create user model “user.rb”
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Step:4 run the migrate command to insert the User table in your database.
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Step:5 create an app in facebook to get “App-ID” and “App Secret”
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Step:6 now you need to declare the provider name and app id and key.Go to the file config/initializers/omniauth.rb
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Step:7 create a new controller named as “sessions_controller.rb”.Add the following method in it.