Scrapy嵌套页面爬行

Question

I am struggling with nested page crawling.

I only get the items as number as the first crawled page item count.

The site structure will be like this.

1. Crawl Brands - Brand links
2. Using Brand links go and crawl Models and Model links
3. Using Model links go and crawl a specific announcement and its attributes.

Lets say Brand A has 2 Models and in first model there are 11 announcements, in second model there are 9. Brand B has 3 Models and each model has 5 announcements.

In the example above I need to get each announcement as separate item (total 35), but instead of that I get items number as Brands like Brand A with first announcement, then Brand B with first announcement.

class SiteSpider(CrawlSpider):
log.start(logfile="log.txt", loglevel="DEBUG", logstdout=None)
name = "site"
#download_delay = 2
allowed_domains = ['site.com']
start_urls = ['http://www.site.com/search.php?c=1111']
items = {}


def parse(self, response):
    sel = Selector(response)
    #requests =[]
    brands = sel.xpath("//li[@class='class_11']")
    for brand in brands:
        item = SiteItem()
        url = brand.xpath('a/@href')[0].extract()
        item['marka'] = brand.xpath("a/text()")[0].extract()
        item['marka_link'] =  brand.xpath('a/@href')[0].extract()
        request = Request("http://www.site.com"+url,callback=self.parse_model, meta={'item':item})
        # requests.append(request)
        #
        yield request

def parse_model(self, response):
    sel = Selector(response)
    models = sel.xpath("//li[@class='class_12']")
    for model in models:

        item = SiteUtem(response.meta["item"])
        url2 = model.xpath('a/@href')[0].extract()
        item ['model'] = model.xpath("a/text()")[0].extract()
        item ['model_link'] = url2

    return item

Could you please help this noobie with pseudo code to implement this? I am making a mistake at foundation level I guess.

Answer 1

in your parse_model you have a loop that create items but not yielding them, try to change it to:

def parse_model(self, response):
    sel = Selector(response)
    models = sel.xpath("//li[@class='class_12']")
    for model in models:

        item = SiteUtem(response.meta["item"])
        url2 = model.xpath('a/@href')[0].extract()
        item ['model'] = model.xpath("a/text()")[0].extract()
        item ['model_link'] = url2

        yield item