Update multi nested array in Mongodb

Question

I have a document schema in Mongodb that looks like this:

{
    _id: 1
    tags: [{
        tag: \'foo\'
        links: [{
            link: \'http:www.googl         


        

Answer 1

Perhaps change your first query to:

db.userlinks.update (
    {_id: 1, tags: {$nin: [{tag:'foo'}]}}, 
    {$push: {'tags': {tag:'foo', links:[]}}}, 
    {upsert: true}
)

The $push operation should only affect links, not the tag.

{$push: {'tags.links': {link: 'http://www.google.com', date: '123'} } },

Answer 2

I finally got it... although if anyone can see a better way to do this, please add it as an answer.

// create the userlinks collection if it doesn't exist
// also add a tag 'foo' into it, but only if the tag doesn't exist
db.userlinks.update (
    {_id: '1', 'tags.tag': {$nin: ['foo']}}, 
    {$push: {'tags': {tag:'foo', links:[]}}},
    {upsert: true}
)

// add a link into the 'foo' tag, but only if the link doesn't exist
db.userlinks.update(
    {_id: '1', 'tags.tag': 'foo', 'tags.links.link': {$nin: ['http://foobar.com']}},
    {$push: {'tags.$.links': {link: 'http://foobar.com', date: '15'} } }
)