class IndexPipeline(object):
 
 def __init__(self, index):
 self.index = index
 
 @classmethod
 def from_crawler(cls, crawler):
 return cls(
  index=crawler.settings.get('WHOOSH_INDEX', 'indexes')
 )
 
 def process_item(self, item, spider):
 self.writer = AsyncWriter(get_index(self.index, zufang_schema))
 create_time = datetime.datetime.strptime(item['create_time'], "%Y-%m-%d %H:%M:%S")
 self.writer.update_document(
  url=item['url'].decode('utf-8'),
  title=item['title'],
  description=item['description'],
  create_time=create_time
 )
 self.writer.commit()
 return item

def zufang_query(keywords, limit=100):
 ix = get_index('indexes', zufang_schema)
 content = ["title", "description"]
 query = MultifieldParser(content, ix.schema).parse(keywords)
 result_list = []
 with ix.searcher() as searcher:
 results = searcher.search(query, sortedby="create_time", reverse=True, limit=limit)
 for i in results:
  result_list.append({'url': i['url'], 'title': i['title'], 'create_time': i['create_time']})
 return result_list