How do I update email address into upper case in mongodb

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I have a document in Mongo database like below

{
"_id" : ObjectId("1234"),
"emailContacts":[
{
"emailPosition": 1,
"emailAddress": "100@qa.com"
}
]
}

I would like to update email address into upper case

What I have tried:

I have tried below scenario:

db.collection.update({"emailContacts.emailAddress":{"$exists": true},
{$set:"emailContacts.emailAddress": $toUpper:{"emailContacts.emailAddress"}},{multi: true}});

the above code is not working. can anyone suggest the best way to update email address.

Posted 20-Aug-19 19:14pm

syam1986

Updated 21-Aug-19 1:07am

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MadMyche · Answer 1 · 2019-08-21T01:07:00

General rule of thumb that I use is to do all formatting of the data at the application layer and not at the database.

That said, what you have tried is the first thing I found; and then I found this one as well

JavaScript

db.whois.find({ "source": { "$exists": true } }).forEach(function(doc) {
    db.whois.update(
        { "_id": doc._id },
        { "$set": { "source": doc.source.toUpperCase() } }
    );
});

Reference:
MongoDB – Update to upper case – Mkyong.com[^]