scrapy | Mongo DB 配置

class MonggoPipline(object):
    def __init__(self,mongo_uri,mongo_db):
        self.mongo_uri=mongo_uri
        self.mongo_db=mongo_db

    @classmethod
    def from_crawler(cls,crawler):
        return cls(
            mongo_uri=crawler.settings.get('MONGO_URI'),
            mongo_db=crawler.settings.get('MONGO_DB')
        )
    def open_spider(self,spider):
        self.client=pymongo.MongoClient(self.mongo_uri)
        self.db=self.client[self.mongo_db]

    def process_item(self,item,spider):
        name=item.__class__.__name__
        self.db[name].insert(dict(item))
        return item

    def close_spider(self,spider):
        self.client.close()