If I have this schema...
person = { name : String, favoriteFoods : Array }
... where the favoriteFoods array is popula
favoriteFoods
There is no $contains operator in mongodb.
$contains
You can use the answer from JohnnyHK as that works. The closest analogy to contains that mongo has is $in, using this your query would look like:
$in
PersonModel.find({ favouriteFoods: { "$in" : ["sushi"]} }, ...);