如何从mongo Symfony中删除和更新原始数据类型字段

Question

我有一个如下存储的Task文档：

 {
  "AssignTo": [
    {
      "$ref": "OrganisationUser",
      "$id": ObjectId("533665fcd841f8c00b000029"),
      "$db": "workStakMaster"
    }
  ],
  "BudgetedTime": "",
  "Client": {
    "$ref": "organisationClient",
    "$id": ObjectId("53327cebd841f8dc1000002a"),
    "$db": "workStakMaster"
  },
  "Project": {
    "$ref": "organisationProject",
    "$id": ObjectId("5332c9afd841f8fc1000002b"),
    "$db": "workStakMaster"
  },
  "RepeatType": "onetime",
  "TaskStatus": "NotStarted",
  "TimeSpentTillDate": "",
  "createdAt": ISODate("2014-04-03T10:57:31.0Z"),
  "description": "hi                                                ",
  "isActive": true,
  "isChargable": "No",
  "name": "A Task",
  "reminder": {
  "Daily": {
      "Time": ""
    }
  },
  "updatedAt": ISODate("2014-04-03T10:57:31.0Z")
}

我想更新＆＃34; AssignTo＆＃34; （将许多用户存储为关系）如果是，则只有字段可以让我知道确切的方法。

谢谢你提前