擅长:python、mysql、java
<p>根据<a href="http://www.mongodb.org/display/DOCS/Updating" rel="noreferrer">MongoDB Docs</a>和<a href="http://api.mongodb.org/python/current/api/pymongo/collection.html#pymongo.collection.Collection.update" rel="noreferrer">PyMongo Docs</a>将更新的第三个参数作为true发送。</p>
<pre><code>self.users.update({"user_id": event['userid']}, {'$push': {'campaigns': UserCampaign}}, True)
</code></pre>