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→DeviseとOmniauthでGoogle、Twitter、Facebook認証
$ rails g migration AddOmniauthToUsers provider:string uid:string
<nowiki># config/initializers/devise.rb
config.omniauth :facebook, ENV['FACEBOOK_KEY'], ENV['FACEBOOK_SECRET'], scope: 'email', info_fields: 'email', callback_url: "#{ENV['HOST']}/users/auth/facebook/callback"
config.omniauth :twitter, ENV['TWITTER_API_KEY'], ENV['TWITTER_API_SECRET'], scope: 'email', oauth_callback: "#{ENV['HOST']}/users/auth/twitter/callback"
config.omniauth :google_oauth2, ENV['GOOGLE_CLIENT_ID'], ENV['GOOGLE_CLIENT_SECRET'], scope: 'email', redirect_uri: "#{ENV['HOST']}/users/auth/google_oauth2/callback"
OmniAuth.config.logger = Rails.logger if Rails.env.development?</nowiki>
