Mongodb Mongoose嵌套数组过滤器

我在Mongo中有一个模式，如下所示：

{
"_id" : ObjectId("5c73cbeb2258414c5d9bf2a5"),
"make" : {
    "name" : "Excel Boats",
    "models" : [
        {
            "year" : 2012,
            "name" : "1860V86",
            "subModels" : [
                {
                    "name" : "",
                    "controlNumber" : "OB1133079",
                    "protoTypeNumber" : "",
                    "status" : "A",
                    "classCode" : "OB",
                    "boatType" : "UT",
                    "powerType" : "OU",
                    "boatLength" : 18,
                    "horsePower" : 70,
                    "hullConstruction" : "A",
                    "msrp" : 9589,
                    "lowCostAmount" : 4700,
                    "highCostAmount" : 5270,
                    "retailAmount" : 6540,
                    "notes" : ""
                },
                {
                    "name" : "",
                    "controlNumber" : "OB1133080",
                    "protoTypeNumber" : "",
                    "status" : "A",
                    "classCode" : "OB",
                    "boatType" : "UT",
                    "powerType" : "OU",
                    "boatLength" : 18,
                    "horsePower" : 90,
                    "hullConstruction" : "A",
                    "msrp" : 10889,
                    "lowCostAmount" : 4900,
                    "highCostAmount" : 5970,
                    "retailAmount" : 6840,
                    "notes" : ""
                }
            ]
        }
    ]
}

我正在尝试过滤数据，以便能够返回mrsp值仅为9589的子模型。这是我目前拥有的代码，但它为子模型返回了一个空数组

db.boats.aggregate({
      $match: {
        $and: [
          {'make.name': 'Excel Boats'},
          {'make.models.year': 2012},
          {'make.models.name': '1860V86'}
        ]
      }
    },
    {
      $project: {
        'make.models.subModels': {
          $filter: {
            input: '$make.models.subModels',
            as: 'subModel',
            cond: {$eq: ['$$subModel.msrp', 10889]}
          }
        }
      }
    }
  ).pretty()

这是我运行查询时的结果

{
"_id" : ObjectId("5c73cbeb2258414c5d9bf2a5"),
"make" : {
    "models" : [
        {
            "subModels" : [ ]
        }
    ]
}

}

我希望得到的是这个结果

{
"_id" : ObjectId("5c73cbeb2258414c5d9bf2a5"),
"make" : {
    "models" : [
        {
            "subModels" : [ {
                "name" : "",
                "controlNumber" : "OB1133079",
                "protoTypeNumber" : "",
                "status" : "A",
                "classCode" : "OB",
                "boatType" : "UT",
                "powerType" : "OU",
                "boatLength" : 18,
                "horsePower" : 70,
                "hullConstruction" : "A",
                "msrp" : 9589,
                "lowCostAmount" : 4700,
                "highCostAmount" : 5270,
                "retailAmount" : 6540,
                "notes" : ""
            } ]
        }
    ]
}

}

如果有人能提供我哪里出错的任何信息，我将不胜感激。我感觉它与数组中的嵌套数组有关，因为我能够毫无问题地获取模型数组中的信息

---

提前谢谢

查询中的键入错误

cond: {$eq: ['$$subModel.msrp', 9589]}

---

查询中的输入错误

cond: {$eq: ['$$subModel.msrp', 9589]}

---

哦，是的，有一个输入错误，但即使更正了，它也不起作用，仍然返回空的子模型。我也尝试过其他按键，比如lowCostAmount、highCostAmount等。哦，是的，有一个输入错误，但即使更正了，它也不起作用，仍然返回空的子模型。我也尝试过其他的按键，比如lowCostAmount，highCostAmount等等。