Mongodb查询以合并多个文档中的属性

Question

从mongodb 3.4.6中的多个文档合并属性

我想将以下所有文档合并为1个文档，在预期响应中具有以下属性。我正在使用mongodb 3.4.6

注意：我尝试使用$ mergeObjects＆与mongodb版本3.4.6不兼容。有人可以建议。

预期：

{
    "_id": "76778",
    "Colour": "GREY",
"size":"Small"
    "Attr": [{
        "AttrId": 1,
        "AttrText" : "12270"
  },
  {
  "AttrId" : 2, 
  "AttrText": "12271"
    },
    {
        "AttrId": 7,
        "AttrValueId": "44"

    },
    {
        "AttrId": 8,
        "AttrDate": "2009-04-15T01:00:00Z"

    }
    ]

}

来自mongodb的源文件

文档1

{ 
    "_id" : "Product_76778", 
    "ProductDesc" : {
        "ProdNo" : "76778", 
        "Colour" : "GREY", 
"size":"Small"

    }, 
    "ProductType" : "SKU", 
    "ProdNo" : "76778", 
    "OrderLevel" : 1
}

Doc 2

{ 
    "_id" : "ProductAttr_76778_2", 
   "ProdNo" : "76778", 
    "AttrId" : 1, 
    "AttrText" : "12270",
    "OrderLevel" : 2    
}

Doc 3

{ 
    "_id" : "ProductAttr_76778_3", 
   "ProdNo" : "76778", 
    "AttrId" : 2, 
    "AttrText" : "12271", 
    "OrderLevel" : 2
}

Doc 4

{ 
    "_id" : "ProductAttr_76778_4", 
    "ProdNo" : "76778",
    "AttrId" : 7, 
    "AttrValueId" : "44", 
    "OrderLevel" : 2

}

Doc 5

{ 
    "_id" : "ProductAttr_76778_5", 
    "ProdNo" : "76778",
    AttrId" : 8, 
    "AttrDate" : "2009-04-15T01:00:00Z", 
    "OrderLevel" : 2
}