how can I update a field with 2 possible values according to a condition?

Question

I am new to mongodb.

I have a database like this:

{
 "universe": "DC",
 "characters": [
 {"name": "superman&qu         


        

Answer 1

Starting in MongoDB 3.6, when updating an array field, you can specify arrayFilters that determine which array elements to update.

mydb.collection.findOneAndUpdate(
    {
        universe: "DC"
    },
    {
        $set : {
            "characters.$[has].selected" : true,
            "characters.$[not].selected" : false
        }
    },
    { 
        arrayFilters: [ 
            { 
                "has.name": { $eq: "wonder woman" }
            },
            { 
                "not.name": { $ne: "wonder woman" }
            } 
        ],
        returnNewDocument: true
    }
)

• The following operation finds a document where the universe field equals "DC"
• uses the filtered positional operator $[] with the arrayFilters to modify the selected to true for all elements in the characters array where the name (has.name) is $eq to "wonder women"
• other side the arrayFilters to modify the selected to false for all elements in the characters array where the name (not.name) is $ne to "wonder women".
• returnNewDocument: true return updated document