Update a mongodb document based on its value

Question

I'm trying to update some documents in mongodb, basically what I want is to multiply by 2 some property, how can I achieve that?

This is what I tried running:

db.getCollection('myCollection').update({kId:"house"},
    {$set:
        {
            Count: NumberInt(Count*2) <-- this is illegal
        }
    },{multi:true}
    )

Can anyone tell me how to do that properly?

Thanks!

thegreenogre · Accepted Answer · 2015-10-22 09:11:20Z

3

You can use $mul operator.

db.getCollection('myCollection').update(
{kId:"house"},
{$mul:
    {
        Count: 2
    }
},
{multi:true}
)

answered Oct 22, 2015 at 9:11

thegreenogre

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