Devise limit one session per user at a time

by

This gem works well: https://github.com/devise-security/devise-security

Add to Gemfile

gem 'devise-security'

after bundle install

rails generate devise_security:install

Then run

rails g migration AddSessionLimitableToUsers unique_session_id

Edit the migration file

class AddSessionLimitableToUsers < ActiveRecord::Migration
  def change
    add_column :users, :unique_session_id, :string, limit: 20
  end
end

Then run

rake db:migrate

Edit your app/models/user.rb file

class User < ActiveRecord::Base
  devise :session_limitable # other devise options
  ... rest of file ...
end

Done. Now logging in from another browser will kill any previous sessions. The gem actual notifies the user that he is about to kill a current session before logging in.

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