$push

Add new elements to an array field in the specified column. The $push method appends one or more values to an existing array without replacing the entire array. For example, if the current value of a column is ["apple", "banana"] and you use $push: "cherry" or $push: $each: ["cherry"], the updated array becomes ["apple", "banana", "cherry"]. This is useful for maintaining and expanding lists within database records.

await Member.$update({
    $where: { 
        age: { 
            $eq: 16 
        } 
    },
    $update: {
        $push: {
            badges: 'CEO'
        }
    }
});

await Member.$update({
    $where: { 
        age: { 
            $eq: 16 
        } 
    },
    $update: {
        $push: {
            badges: {
                $each: ['CEO','VIP','SEO','Owner'],
                $position: 1,
                $sort: -1
            }
        }
    }
});