Ruby: Exception handling

gistfile1.txt

def save
  tour = Tour.find(tour_id)
  discourse_user = DiscourseZr.client.user_by_external_id(user_id)
  discourse_user = DiscourseZr.sync_sso(User.find(user_id)) if discourse_user.nil?
  client = DiscourseZr.client(username: discourse_user['username'])
  client.create_post(topic_id: tour.discourse_topic_id, raw: content)
rescue DiscourseApi::Error => e
  begin
    discourse_errors = JSON.parse(e.message.gsub('=>',':'))['errors']
    discourse_errors.each { |error| errors.add(:field, error) }
    false
  rescue
    unknow_error
  end
rescue
  unknow_error
end

private

def unknow_error
  errors.add(:base, 'Ocorreu um erro desconhecido, por favor tente novamente. Se o problema persistir, contate o administrador do sistema.')
  false
end

I would like to be able to write this as:

rescue DiscourseApi::Error => e
  discourse_errors = JSON.parse(e.message.gsub('=>',':'))['errors']
  discourse_errors.each { |error| errors.add(:field, error) }
  false
rescue
  unknow_error
end