Question

I found a StackOverflow Question that comes very close to answering my question, but not quite there.

Take this original question (modifying a document that is in an array) but assume that you do not have a specific change you wish to make. Instead, I have a dictionary of changes that I wish to make. Here is an example:

Original Document

{
    _id: something,
    recipients: [{id:1, name:"Andrey", isread:false}, {id:2, name:"John", isread:false}]
}

Changes to be made

{
    isread: true,
    fullname: 'jonathan'
}

How can I apply this dictionary of changes to John (id:2)?
Incase it is relevant, I am using the MongoDB-Node.JS Driver
Thank you

Answer 1

Just like in the question you referenced, you need to use the $ positional operator, but with update in this case:

collection.update({_id:something, 'recipients.id': 2}, {$set: {'recipients.$': {
    isread: true,
    fullname: 'jonathan'
}}}, function (err) {...

EDIT

To not replace the whole array element object you’d have to do something like this:

collection.update({_id:something, 'recipients.id': 2}, {$set: {
    'recipients.$.isread': true,
    'recipients.$.fullname': 'jonathan'
}}, function (err) {...