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Message from discussion Update of Embedded Array Object
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copypastecoder  
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 More options Apr 25 2012, 7:42 pm
From: copypastecoder <sur...@gmail.com>
Date: Wed, 25 Apr 2012 16:42:36 -0700 (PDT)
Local: Wed, Apr 25 2012 7:42 pm
Subject: Re: Update of Embedded Array Object
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Thanks for your post, i kept trying to update in so many different ways,
and not understanding why somethings like {comments.votes...} wasn't
recognized in an update. For some reason i glossed over the positional
operator, and it's exactly what I needed.

On Wednesday, April 25, 2012 10:53:38 AM UTC-5, Marc wrote:

> The update statement that you provided should work:

> db.pets.save({name:'Mark',pets:[{type:'dog',name:'fido'},{type:'cat',name:' puss'}]})

> > db.pets.save({name:'John',pets:[{type:'dog',name:'rex'}]})
> > db.pets.find().pretty()
> {
>         "_id" : ObjectId("4f981b7231eb8983025f1579"),
>         "name" : "Mark",
>         "pets" : [
>                 {
>                         "type" : "dog",
>                         "name" : "fido"
>                 },
>                 {
>                         "type" : "cat",
>                         "name" : "puss"
>                 }
>         ]
> }
> {
>         "_id" : ObjectId("4f981b9131eb8983025f157a"),
>         "name" : "John",
>         "pets" : [
>                 {
>                         "type" : "dog",
>                         "name" : "rex"
>                 }
>         ]
> }
> > db.pets.update({'name':'Mark',"pets.type":'dog'},
> {$set:{'pets.$.name':'rover'}})
> > db.pets.find().pretty()
> {
>         "_id" : ObjectId("4f981b7231eb8983025f1579"),
>         "name" : "Mark",
>         "pets" : [
>                 {
>                         "name" : "rover",
>                         "type" : "dog"
>                 },
>                 {
>                         "type" : "cat",
>                         "name" : "puss"
>                 }
>         ]
> }
> {
>         "_id" : ObjectId("4f981b9131eb8983025f157a"),
>         "name" : "John",
>         "pets" : [
>                 {
>                         "type" : "dog",
>                         "name" : "rex"
>                 }
>         ]
> }

> The positional operator was introduced in version 1.4.  Are you using
> a really old version of Mongo?  Have you checked for obvious things,
> like typeos and capitalization?

> If your update still does not work, please give the version of Mongo
> that you are using and the exact steps that you take that fail to make
> the update, and we will attempt to reproduce.  Thanks.


 
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