permission.rb

# This is inside Goldencobra::Permission model
after_commit :set_cache_key

def self.restricted?(item)
  @@last_permission ||= Goldencobra::Permission.reorder(:updated_at).last
  Rails.cache.fetch("#{@@last_permission.cache_key}#{item.cache_key}") do
    where(subject_class: item.class, subject_id: item.id).count > 0
  end
end

private

def set_cache_key
  @@last_permission = Goldencobra::Permission.reorder(:updated_at).last
  return true
end