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Push to array inside subdocument in mongoose

I would like to click on an array that is inside a subdocument in Mongoose / MongoDB.

Here is the diagram:

var UsersSchema = new mongoose.Schema({
    user: String,
    stream: String,
    author: String,
    tags: Array,
    thumb: Number,
    added: Number
})

var ContentSchema = new mongoose.Schema( {
    title: String,
    url: String,
    description: String,
    text: String,
    users: [ UsersSchema ]  
})

I would like to push an array into an array UserSchema.tagsfor a specific sub-document users.

I have tried this and a few options: https://stackoverflow.com/a/166778/

By default, my external Angular application sends tags as an array of objects. So,

[ { 'text': TAG_STRING_HERE } ]

or

[ { 'text': TAG_STRING_HERE }, { 'text': TAG2_STRING_HERE } ]

But I also tried using string arrays, which I do fine if for some reason the objects are a problem.

I tried this:

var tags = req.body.tags,
    contentId = mongoose.Types.ObjectId( req.body.id )

Content.update( 
    { 'users._id': contentId },
    { $push: { 'users.tags': { $each: tags } } }
).exec()
.then( function ( result ) { 
    console.log( result )
    resolve( result )
}, function ( error ) {
    if ( error ) return reject( error )
})

Which gives me this error:

{ [MongoError: cannot use the part (users of users.tags) to traverse the element ({users: [ { user: "54f6688c55407c0300b883f2", added: 1428080209443.0, stream: "watch", _id: ObjectId('551ec65125927f36cf4c04e9'), tags: [] }, { user: "54f6688c55407c0300b883f2", added: 1428080222696.0, stream: "listen", _id: ObjectId('551ec65e25927f36cf4c04ea'), tags: [] } ]})]
name: 'MongoError',
code: 16837,
err: 'cannot use the part (users of users.tags) to traverse the element ({users: [ { user: "54f6688c55407c0300b883f2", added: 1428080209443.0, stream: "watch", _id: ObjectId(\'551ec65125927f36cf4c04e9\'), tags: [] }, { user: "54f6688c55407c0300b883f2", added: 1428080222696.0, stream: "listen", _id: ObjectId(\'551ec65e25927f36cf4c04ea\'), tags: [] } ]})' }
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1 answer

. , Q Express. - 'users.$.tags. , , , , ! $pushAll, $each . tags .

var tags = req.body.tags,
    contentId = mongoose.Types.ObjectId( req.body.id )

console.log( tags )

Content.update( 
    { 'users._id': contentId },
    { $pushAll: { 'users.$.tags': tags } }
).exec()
.then( function ( result ) { 
    console.log( result )
    resolve( result )
}, function ( error ) {
    if ( error ) return reject( error )
})
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