在第一次请求/解析之前在Spider中草率地返回项目

Question

I need to return some items from inside a spider before starting to parse requests. Because I need to make sure some parent items exist in database before parsing child items.

I now yield them from the parse method first thing, and this seem to work fine. But I was wondering if there is a better way to do this?

Answer 1

不用产生项目，而是直接在将常规项目添加到数据库的管道的构造函数中将它们写入数据库。