Mongodb find() query : return only unique values (no duplicates)

mongodb mongodb-query
Franckl picture Franckl · Jan 26, 2015 · Viewed 124.9k times · Source

I have a collection of documents :

{
    "networkID": "myNetwork1",
    "pointID": "point001",
    "param": "param1"
}
{
    "networkID": "myNetwork2",
    "pointID": "point002",
    "param": "param2"
}
{
    "networkID": "myNetwork1",
    "pointID": "point003",
    "param": "param3"
}
...

pointIDs are unique but networkIDs are not.

Is it possible to query Mongodb in such a way that the result will be : [myNetwork1,myNetwork2]

right now I only managed to return [myNetwork1,myNetwork2,myNetwork1]

I need a list of unique networkIDs to populate an autocomplete select2 component. As I may have up to 50K documents I would prefer mongoDb to filter the results at the query level.

Answer

Laura Uzcategui picture Laura Uzcategui · Jan 26, 2015

I think you can use db.collection.distinct(fields,query)

You will be able to get the distinct values in your case for NetworkID.

It should be something like this : 

Db.collection.distinct('NetworkID')

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