Scrapy 爬虫不跟随链接

Question

I am having some trouble trying to figure out why my secondary function is failing to follow through to the new link and then output data. the parse function works just fine. It's when it calls back to parse_puppy that nothing happens. When I check the json output I see that everything from puppy was successfully scraped, but there's nothing from parse_puppy .

On line 28, if I change the method to follow I get results, but it's the same result about dozen times.

Code:

import scrapy
from scrapy.cmdline import execute

class Spider(scrapy.Spider):
    name = "puppyDetails"

    def start_requests(self):
        urls = ['https://ws.petango.com/webservices/adoptablesearch/wsAdoptableAnimals.aspx?species=Dog&gender=A&agegroup=UnderYear&location=&site=&onhold=A&orderby=name&colnum=3&css=http://ws.petango.com/WebServices/adoptablesearch/css/styles.css&authkey=io53xfw8b0k2ocet3yb83666507n2168taf513lkxrqe681kf8&recAmount=&detailsInPopup=No&featuredPet=Include&stageID=&wmode=opaque']
        for url in urls:
            yield scrapy.Request(url=url, callback=self.parse)

    def parse(self, response):
        # GRAB ALL TOPICAL PUPPY DETAILS
        for animal in response.css("div.list-animal-info-block"):
            yield {
                'puppy_name': animal.css('div.list-animal-name a::text').get(),
                'puppy_id': animal.css('div.list-animal-id::text').get(),
                'puppy_sex': animal.css('div.list-animal-sexSN::text').get(),
                'puppy_breed': animal.css('div.list-animal-breed::text').get(),
                'puppy_age': animal.css('div.list-animal-age::text').get(),
                'puppy_link': animal.css('div.list-animal-name a::attr(href)').get()
            }

            # DIVE INTO DETAILS PAGE
            detail_page = response.css('div.list-animal-name a::attr(href)').get()
            self.logger.info('get puppy details')
            # GO TO THE PUPPY DETAILS
            yield response.follow_all(detail_page, callback=self.parse_puppy)

    def parse_puppy(self, response):
        # GRAB PUPPY DETAILS
        for puppyDetails in response.xpath('//*[@class="detail-table"]//tr'):
            yield {
                'puppy_id': puppyDetails.xpath('//*[@id="lblID"]/text()').extract(),
                'puppy_status': puppyDetails.xpath('//*[@id="lblStage"]/text()').extract(),
                'puppy_intake_date': puppyDetails.xpath('//*[@id="lblIntakeDate"]/text()').extract()
            }

execute(['scrapy','crawl','puppyDetails'])

Error:

ERROR: Spider must return Request, BaseItem, dict or None, got 'generator' in <GET https://ws.petango.com/webservices/adoptablesearch/wsAdoptableAnimals.aspx?species=Dog&gender=A&agegroup=UnderYear&location=&site=&onhold=A&orderby=name&colnum=3&css=http://ws.petango.com/WebServices/adoptablesearch/css/styles.css&authkey=io53xfw8b0k2ocet3yb83666507n2168taf513lkxrqe681kf8&recAmount=&detailsInPopup=No&featuredPet=Include&stageID=&wmode=opaque>

Answer 1

The line should be

yield from response.follow_all(detail_page, callback=self.parse_puppy)