Is there any way to replace an entire array in MongoDB?

Question

So, I have a problem in MongoDB... I have stored some data in MongoDB and it basically looks like:

{
    _id: 1,
    name: "aa",
    importance: [0.5, 0.25, 0.25]
}

Where this importance attribute is an array that I will have to keep updating, e.g., after getting some data, it should be updated to [0.80, 0.10, 0.10]...

In this toy problem, I don't really understand how to replace a full array. Do I have to do it elementwise somehow? If so, it is not a tractable solution in my case, because the number of elements in my array reach above 1000.

Have you looked this $each

Neo-coder
– Neo-coder

2015-06-08 17:38:14 +00:00
Commented Jun 8, 2015 at 17:38 — Neo-coder
– Neo-coder, Commented Jun 8, 2015 at 17:38

JohnnyHK · Accepted Answer · 2015-06-08 17:38:07Z

2

You can replace the entire importance array in an update by using $set:

db.test.update({_id: 1}, {$set: {importance: [0.80, 0.10, 0.10]}})

answered Jun 8, 2015 at 17:38

JohnnyHK

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1 Comment

Arnab Bhadury Over a year ago

Thanks sooo much! I was reading the docs and still somehow missed out on $set.

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