Does devise have call backs when a user signs in and out?

This is what I came up with:

Warden::Manager.after_authentication do |user,auth,opts|
  user.update_attribute(:currently_signed_in, true)
end

Warden::Manager.before_logout do |user,auth,opts|
  user.update_attribute(:currently_signed_in, false)
end

This is what I came with to track users that are currently signed in.

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I'm no expert but I believe the callbacks (hooks) are at the Warden level (Devise is built on top of Warden).

after_set_user and before_logout in Warden should do the trick for you but there are other options listed in Warden::Hooks

---

您可以像这样覆盖应用程序控制器中的sign_in

 def sign_in(*args)
   super(*args)
    # do whatever you want here
    token = current_user.authentications.where(provider: "facebook").first.token
    facebook = Koala::Facebook::API.new(token)
    session[:facebook] = facebook
end

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