从现有 MongoDB 条目中删除键/值
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Deleting a key/value from existing MongoDB entry
提问by Chris
I need to delete a certain key and value from every entry in a particular collection. I've looked into remove and that seems to be for only entire entries. Looking at update, I don't believe updating a particular key with null or an empty string would achieve what I'm trying to do. I'm very much a beginner with mongodb, so please excuse my ignorance.
我需要从特定集合中的每个条目中删除某个键和值。我已经研究过删除，这似乎只适用于整个条目。查看更新，我不相信用 null 或空字符串更新特定键会实现我想要做的事情。我是 mongodb 的初学者，所以请原谅我的无知。
Long story short, how can I turn
长话短说，我该如何转身
{
"_id" : 1234,
"name" : "Chris",
"description" : "Awesome"
}
into
进入
{
"_id" : 1234,
"name" : "Chris"
}
without deleting the entry and creating a new one, or using any non-mongodb commands? Thanks!
不删除条目并创建新条目，或使用任何非 mongodb 命令？谢谢！
回答by Bee San
Try $unsetin a call to update().
尝试$unset调用update()。
Like this:
像这样：
db.collection_name.update({ _id: 1234 }, { $unset : { description : 1} })
And, as vikneshwarcommented, if you want to remove one field from all (or multiple) documents you can use updateMany()like this:
而且，正如vikneshwar评论的那样，如果您想从所有（或多个）文档中删除一个字段，您可以updateMany()像这样使用：
db.collection_name.updateMany({}, { $unset : { description : 1} })
回答by aspadacio
To reference a package and remove various "keys", try this
要引用一个包并删除各种“键”，试试这个
db['name1.name2.name3.Properties'].remove([ { "key" : "name_key1" }, { "key" : "name_key2" }, { "key" : "name_key3" } )]
回答by Adrien M.
Also think about upsert()that will insert your row as a new document if _iddoes not exist or update the existing document if any.
还要考虑upsert()将您的行作为新文档插入（如果_id不存在）或更新现有文档（如果有）。
