GraphQLList自定义类型将mongodb字段返回为null

Question

我在node.js中使用mongodb，我试图返回一个自定义对象列表的字段。我曾尝试过无论是否有过#Array（）＆＃39;在查询结束时但似乎没有改变结果

我有一个自定义类型，我的GraphQL架构看起来大致相似（少了根商店/查看器的代码等）

let addressType = new GraphQLObjectType({
   name: 'Address',
   fields: () => ({
      addressType: {type: GraphQLString, resolve: (obj) => obj.AddressType },
      addressLineOne: {type: GraphQLString, resolve: (obj) => obj.AddressLineOne}
   });
});

let userType = new GraphQLObjectType({
   name: 'User',
   fields: () => ({
      CustomId: {type: GraphQLID, resolve: (obj) => obj.CustomID},
      name: {type: GraphQLString},
      addresses: {
         type: GraphQLList(addressType),
         resolve: (user) => {
            let findParams = {
               CustomID: user.CustomID
            };

            let returnParams = {
               USER_ADDRESSES: 1
            }

            return db.collection("User").find(findParams, returnParams).toArray();
         }
      }
   })
});

我的mongo文档看起来像......

"Name":"Joe",
"CustomID":"12345",
"USER_ADDRESSES": 
[
   {
      "AddressType" : "Home",
      "AddressLineOne" : "123 Maple st"
   },
   {
      "AddressType" : "AlternateAddress",
      "AddressLineOne" : "456 Main St"
   }
]

使用graphiql测试查询的模式

{
   store{
      user(CustomID:"12345"){
         name,
         addresses {
            addressType,
            addressLineOne
         }
      }
   }
}

哪一回......

{
   "data":{
      "store": {
         "user": {
            "name": "Joe",
            "addresses" : [
               "addressType": null,
               "addressLineOne": null
            ]
         }
      }
   }
}