Scrapy:在方法之间传递项目

问题描述

假设我有一个Bookitem，我需要在解析阶段和细节阶段给它添加信息

Suppose I have a Bookitem, I need to add information to it in both the parse phase and detail phase

def parse(self, response)
    data = json.loads(response)
    for book in data['result']:
        item = BookItem();
        item['id'] = book['id']
        url = book['url']
        yield Request(url, callback=self.detail)

def detail(self,response):
    hxs = HtmlXPathSelector(response)
    item['price'] = ......
#I want to continue the same book item as from the for loop above

按原样使用代码会导致详细信息阶段出现未定义的项目.如何将项目传递给详细信息?detail(self,response,item) 似乎不起作用.

Using the code as is would led to undefined item in the detail phase. How can I pass the item to the detail? detail(self,response,item) doesn't seem to work.

推荐答案

Request 有一个名为 meta 的参数:

There is an argument named meta for Request:

yield Request(url, callback=self.detail, meta={'item': item})

然后在函数detail中，这样访问:

then in function detail, access it this way:

item = response.meta['item']

在此处查看有关职位主题的更多详细信息.

See more details here about jobs topic.

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