How to use $in or $nin in mongo aggregation $group $cond

Question

I want to achieve $sum with $cond by having $or on property:

db.collectionName.aggregate(
{
   \"$group\": {
     \"_id\":\'$created_at\',
     \"count\": {\"$su         


        

Answer 1

I think that $in isn't an aggregation pipeline operator.