Pymongo 如何正确使用 $push 更新现有文档 [英] Pymongo how to properly use $push to update an existing document

问题描述

我做错了什么或者我不明白 $push (可能不明白).无论如何，我有以下文件:

I am doing something wrong or I don't understand $push (probably don't understand). Anyway I have the following document:

{
  "_id" : ObjectId("501c83051d41c8753e000000"), 
  "node" : "denver", 
  "enc" : {
    "environment" : "production",
    "classes" : {
      "denver" : ""
    }
  }, 
  "inherit" : "default"
}

我正在尝试制作文档

{
  "_id" : ObjectId("501c83051d41c8753e000000"), 
  "node" : "denver", 
  "enc" : {
    "environment" : "production", 
    "classes" : {
      "denver" : "",
      "boulder" : ""
    }
  }, 
  "inherit" : "default"
}

这是我的更新语句的样子:

This is what my update statement looks like:

col.update(
  {
    'node' : 'denver'
  }, 
  {
    '$push': {
      'enc.classes' : {
        'boulder': ''
      }
    }
  },
True)

我没有收到错误，但文档永远不会更新.如果我将 $push 更改为 $set，那么 denver 将被替换为 boulder.

I don't get an error but the document never updates. If I change $push to $set then the denver is replaced with boulder.

感谢您的任何帮助.

推荐答案

此查询有效.

db.foo.update({"node": "denver"}, {"$set": {"enc.classes.boulder": ""}}

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