Question

begin
  ActiveRecord::Base.transaction do
    installations.each do |installation|
      id = installation.id
      installation = current_user.installations.find_by(:id=> id)
      @ticket = installation.tickets.new(ticket_params)
      unless @ticket.save
        raise ActiveRecord::Rollback
      end
    end
  end
  redirect_to '/tickets', notice: "done"
rescue ActiveRecord::Rollback
  render action: "new", notice: "problem" and return
end

想象一下，我们有两张票，第一张票有效，第二张无效。在此代码中，将保存第一张票。但是我想在一次失败时回滚所有的票。我怎么能这样做？

Answer 1

你可以构建一个@ticket.save的返回值集合，在它们上面调用.all?，如果你得到一个虚假的提升回滚：

ActiveRecord::Base.transaction do
  installations.each do |installation|
    tickets_saved = []
    id = installation.id
    installation = current_user.installations.find_by(:id=> id)
    ticket = installation.tickets.new(ticket_params)
    tickets_saved << ticket.save
  end

  unless tickets_saved.all?
    raise ActiveRecord::Rollback
  end
end

如果一个对象失败，则所有对象都回滚

1 个答案: