嵌入式数组mongodb上的$ pull / $ pop

Question

I have a simple collection with the following schema

{
 name:"John",
 brands:[
 {
  name:"some",
  email:"asdf@some.com"
 },
 {
  name:"blah"
  email:"blah@blah.com"
 }
]
}

i'm using the following query to remove the embedded object inside my brands array field:

var args = {
'query':{name:"John",brands.email:"asdf@some.com"}
,update:{
'$pull':{
 'brands.$.email:"asdf@some.com"
}
}
}

i'm using nodejs driver for mongodb and when i run the above using following:

collectionName.findAndModify(args,function(req,res){

})

I get the following error:

MongoError: Cannot apply $pull/$pullAll modifier to non-array

I guess i'm doing correct but still getting this error. Any help appreciated.

Answer 1

Your $pull is targeting email which isn't an array. If you're trying to remove the matching element, you can do it like this:

var args = {
  query: {name: "John"},
  update: {
    '$pull': {
      brands: {email: "asdf@some.com"}
    }
  }
}

or if you're trying to remove the email field, use $unset instead:

var args = {
  query: {name: "John", "brands.email": "asdf@some.com"},
  update: {
    '$unset': {
      'brands.$.email': 1
    }
  }
}