using $match in mongodb aggregation

Question

I have a variable in my Node function.

var storeId;

The value of storeId may or may not be undefined.

Now, if it is undefined, I do not want $match to filter out based on this parameter . If storeId has a value, $match should filter out based on storeId.

$match: {
       type: "abc",
      "_store._id":storeId?: //something like if else here 
    }

What should I add here ?

I'd just have if/else condition in my javascript to check if storeId is undefined, then I use the query without _store._id and if storeId has some value then use the query with _store._id — Jay
– Jay, Commented Jan 4, 2016 at 13:50

Philipp · Accepted Answer · 2016-01-04 14:02:29Z

2

I would solve this by creating an empty object to match against and then populate it conditionally:

var match = {};
if (storeId != undefined) match.storeId = storeId;
if (type != undefined) match.type = type;
//...

and then use that object in the aggregation pipeline:

 { $match: match }

answered Jan 4, 2016 at 14:02

Philipp

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