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heartcombo--devise/lib/devise/hooks/forgetable.rb

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Ruby

# Before logout hook to forget the user in the given scope, if it responds
# to forget_me! Also clear remember token to ensure the user won't be
# remembered again. Notice that we forget the user unless the record is frozen.
# This avoids forgetting deleted users.
Warden::Manager.before_logout do |record, warden, scope|
if record.respond_to?(:forget_me!)
record.forget_me! unless record.frozen?
warden.cookies.delete "remember_#{scope}_token"
end
end