修剪mongo对象大小

问题描述：

This is my document:

{
    "_id": {
        "$oid": "58e9a13999447d65550f4dd6"
    },
    "prices": {
        "20170409": 701.09,
        "20170408": 700.07
    },
    "stock": {
        "20170409": 0,
        "20170408": 0
    }
}

I append a lot of fields in document objects (prices, stock) but over time it ends up being huge, and thats just one document. I have 200k documents and each have prices and stock objects.

Wondering if there's any way I could keep those object size to 30 fields max, that is, older entries purged on reaching the limit?

这是我的文档： p>

  {
“_id  “：{
”$ oid“：”58e9a13999447d65550f4dd6“
}，
”price“：{
”20170409“：701.09，
”20170408“：700.07 
}，
”stock“：{  
“20170409”：0，
“20170408”：0 
} 
} 
  code>  pre> 
 
 我在文档对象中添加了很多字段（价格， 股票）但随着时间的推移，它最终是巨大的，这只是一个文件。 我有200k文件，每个都有价格和库存对象。   p> 
 
 
想知道我是否可以将这些对象大小保持在最多30个字段，也就是说，旧条目在达到限制时被清除？ p> 
  div>

答

Take a look here! You can do it with a combination of $push and $slice, the example on the link sort the array too, don't know if that is your need, but I think you will have a good start from there.

修剪mongo对象大小

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