db={shops:[{_id:ObjectId("623ae52ba5b1af0004e1c4ec"),shopItems:[ObjectId("631e6b133b688a0004a17265"),ObjectId("62f4cc974a255f00044c01b5"),ObjectId("625ffc48eec7b20004c9294c")]},{_id:ObjectId("623ae52ba5b1af0004e1c4eb"),shopItems:[ObjectId("631e6b133b688a0004a17263")]}],shopItems:[{_id:ObjectId("631e6b133b688a0004a17265"),itemName:"Barbie",kidFriendly:true},{_id:ObjectId("62f4cc974a255f00044c01b5"),itemName:"Alcohol",kidFriendly:false},{_id:ObjectId("625ffc48eec7b20004c9294c"),itemName:"Glass Vase",kidFriendly:false},{_id:ObjectId("631e6b133b688a0004a17263"),itemName:"Beach Ball",kidFriendly:true}]}

db.shops.aggregate([{$match:{_id:ObjectId("623ae52ba5b1af0004e1c4ec")}},{$lookup:{from:"shopItems",let:{shopItems:"$shopItems"},pipeline:[{$match:{$expr:{$and:[{$ne:["$kidFriendly",true]},{$in:["$_id","$$shopItems"]}]}}}],as:"adultOnlyItems",},},])