app/controllers/mainpage_controller.rb
class MainpageController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
def show
if user_signed_in?
puts "SUCCESS"
#sign_out current_user
redirect_to "/explore"
else
redirect_to "/intro"
end
end
end