Upsert nested array/objects possible?

gistfile1.txt

I have a schema that looks like this:
band: { 
    albums: [
        { tweets: [ 
            { tweet }, { tweet }
        ] }
    ] 
}

I want to add the band (doc) if it doesn't exist.
I want to add the album if it doesn't exist on the band
I want to add the tweet to the album if it doesn't exist

Do I just do each of these serially or is there a way to upsert?