in app/helpers/sessions_helper.rb [15:26]
def current_user
if (user_id = session[:user_id])
@current_user ||= User.find_by(id: user_id)
elsif (user_id = cookies.encrypted[:user_id])
user = User.find_by(id: user_id)
if user && user.authenticated?(:remember, cookies[:remember_token])
log_in user
@current_user = user
end
end
end