I tried to use $addField where count the num of favorite movies
var favorites = [ "Sandra Bullock", "Tom Hanks", "Julia Roberts", "Kevin Spacey", "George Clooney"]
db.movies.aggregate([{$project:{"num_fav":1,"_id":0,"title":1}},{$addFields:{"num_fav":{$setIntersection:["$favorites","$cast"]}},{$count:"$num_fav"}])
It does not reconize “favourites”
Later I got …