[{"title":"one title","articles":[{content:"lorem ipsum",authorIds:1},{content:"bacon ipsum",authorIds:2},{content:"hippsum dippsum",authorIds:3},{content:"hippsum dippsum",authorIds:4}],}]

db.collection.aggregate([{"$project":{title:1,articles:1,articleCount:{$size:"$articles"},},},{"$redact":{"$cond":{"if":{"$or":[{"$eq":["$authorIds",2]},{$gte:["$articleCount",1]},]},"then":"$$DESCEND","else":"$$PRUNE"}}},])