additional simplification of OffsiteMiddleware

scrapy/contrib/spidermiddleware/offsite.py

@@ -3,13 +3,10 @@ OffsiteMiddleware: Filters out Requests for URLs outside the domains covered by
 the spider.
 """
 
-from itertools import ifilter
-
-from scrapy.item import ScrapedItem
+from scrapy.http import Request
 from scrapy.utils.url import url_is_from_spider
 
 class OffsiteMiddleware(object):
 
     def process_spider_output(self, response, result, spider):
-        filter = lambda x: isinstance(x, ScrapedItem) or url_is_from_spider(x.url, spider)
-        return ifilter(filter, result or ())
+        return (x for x in result if not isinstance(x, Request) or url_is_from_spider(x.url, spider))