如果你有一个post_id字符串，怎么办呢？

blake

1. from bson.objectid import ObjectId
   
2. 
   
3. # The web framework gets post_id from the URL and passes it as a string
   
4. def get(post_id):
   
5.   # Convert from string to ObjectId:
   
6.   document = client.db.collection.find_one({'_id': ObjectId(post_id)})

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