crawlSpider seems not to follow rule - python-2.7

Question

here's my code. Actually I followed the example in "Recursively Scraping Web Pages With Scrapy" and it seems I have included a mistake somewhere.
Can someone help me find it, please? It's driving me crazy, I only want all the results from all the result pages. Instead it gives me the results from page 1.
Here's my code:
import scrapy
from scrapy.selector import Selector
from scrapy.spiders import CrawlSpider, Rule
from scrapy.http.request import Request
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from githubScrape.items import GithubscrapeItem
class GithubSpider(CrawlSpider):
name = "github2"
allowed_domains = ["github.com"]
rules = (
Rule(SgmlLinkExtractor(allow=(), restrict_xpaths=('//*[contains(#class, "next_page")]')), callback='parse_items', follow=True),
)
def start_requests(self):
baseURL = 'https://github.com/search?utf8=%E2%9C%93&q=eagle+SYSTEM+extension%3Asch+size%3A'
for i in range(10000, 20000, +5000):
url = baseURL+str(i+1)+".."+str(i+5000)+'&type=Code&ref=searchresults'
print "URL:",url
yield Request(url, callback=self.parse_items)
def parse_items(self, response):
hxs = Selector(response)
resultParagraphs = hxs.xpath('//div[contains(#id,"code_search_results")]//p[contains(#class, "title")]')
items = []
for p in resultParagraphs:
hrefs = p.xpath('a/#href').extract()
projectURL = hrefs[0]
schemeURL = hrefs[1]
lastIndexedOn = p.xpath('.//span/time/#datetime').extract()
i = GithubscrapeItem()
i['counter'] = self.count
i['projectURL'] = projectURL
i['schemeURL'] = schemeURL
i['lastIndexedOn'] = lastIndexedOn
items.append(i)
return(items)

Answer 1

I didn't find your code on the link you passed, but I think the problem is that you are never using the rules.
Scrapy starts crawling by calling the start_requests method, but the rules are compiled and used on the parse method, which you are not using because your requests go directly from start_requests to parse_items.
You could remove the callback on the start_requests method if you want the rules to be applied on that level.