MongoDB update all elements of nested array within all documents

Question

I have a collection (called Clients) which contains multiple documents, each one representing a client. Each client document contains an array of phoneNumber documents. I would like to update all phoneNumber documents in all the client documents my collection to add a readOnly attribute to each phoneNumber document.

The challenge is that some of the phoneNumber documents have a readOnly attribute which I think is throwing me off...

Example JSON document below;

{
    "_id" : ObjectId("5baa8e5da61b7842284937b7"),
    "clientID" : "00001",
    "firstName" : "Jonathan",
    "middleName" : "Herbert",
    "lastName" : "Alexander",
    "dateOfBirth" : "1965-04-04",
    "email" : "jonalex@hcare.com",
    "phoneNumbers" : [ 
        {
            "phoneID" : "001",
            "number" : "(404) 242-5939",
            "phoneType" : "HOME"
        },
        {
            "phoneID" : "001",
            "number" : "(404) 242-5939",
            "phoneType" : "HOME"
            "readOnly" : true
        },
        {
            "phoneID" : "001",
            "number" : "(404) 242-5939",
            "phoneType" : "HOME"
        }
    ],
    "gender" : "M"
}

In this example, I would like all phoneNumber documents to have the readOnly:false attribute.

I have tried using the following...

db.Clients.update(
   {},
   { $set: { "phoneNumbers.$[].readOnly" : true } },
   { multi: true}
)

...but it is giving me an error about not being about to use the part to traverse the element, so I am stuck.

How can I update all the documents in this collection to add the readOnly field to all elements in each documents' nested phoneNumbers array?

Answer 1

Here would be an example query.
This will push the desired element onto each phone numbers document. If you are not attempting to

var results = db.Clients.find({"phoneNumbers.readOnly" : {$exists : false } });
results.forEach(function (result){
    result.phoneNumbers.forEach(function (doc){
       doc.push({"phoneNumbers.$[].readOnly" : true })
    })
});