array contains in mongodb code example

Example 1: Find document with array that contains a specific value

As favouriteFoods is a simple array of strings, you can just query that field directly:

PersonModel.find({ favouriteFoods: "sushi" }, ...);

model:
person = {
    name : String,
    favoriteFoods : Array
}

Example 2: mongodb find array with element

// Finds all documents that have a property named "tags"
// which has at least one array element matching "red"
db.inventory.find( { tags: "red" } )