node mongoDb 根据key查询嵌套数组

Question

我一直在尝试从MongoDB中的数据中根据键值在数组中找到一个对象，下面是从数据库中查询，但我只需要一些特定的对象，如何可以实现吗？

[
  {
    "_id": "627261a17acf7875b30d6e34",
    "orderItem": [
      [
        {
          "_id": "626fdb9fd0867e51d613530d",
          "productName": "Handmade jewelry",
          "productPrice": "25.99",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productimg4.jpg-1651497883882",
          "sellerId": "62470b37f2052b6a6463f9b3",
          "qty": 1
        },
        {
          "_id": "626fdbf4d0867e51d6135389",
          "productName": "Handmade bucket",
          "productPrice": "23.99",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/topSellingImg.jpg-1651497970510",
          "sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 2
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823", "sellerId": "62470b37f2052b6a6463f9b3",

          "qty": 2
        },
        {
          "_id": "626a5dabae8851064d4760af",
          "productName": "hand bag",
          "productPrice": "20",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/homeImg3.jpg-1651137961920",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 1
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 2
        },
        {
          "_id": "626a5dabae8851064d4760af",
          "productName": "hand bag",
          "productPrice": "20",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/homeImg3.jpg-1651137961920",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 1
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 2
        },
        {
          "_id": "626a5dabae8851064d4760af",
          "productName": "hand bag",
          "productPrice": "20",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/homeImg3.jpg-1651137961920",
 "sellerId": "62470b37f2052b6a6463f9b3",
          "qty": 1
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 2
        },
        {
          "_id": "626a5dabae8851064d4760af",
          "productName": "hand bag",
          "productPrice": "20",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/homeImg3.jpg-1651137961920",
"sellerId": "0062470b37f2052b6a6463f9b30",
          "qty": 1
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823",
          "qty": 2
        },
        {
          "_id": "626a5dabae8851064d4760af",
          "productName": "hand bag",
          "productPrice": "20",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/homeImg3.jpg-1651137961920",
"sellerId": "0062470b37f2052b6a6463f9b45",
          "qty": 1
        }
      ],
      [
        {
          "_id": "626a5d5dae8851064d4760ac",
          "productName": "handmade bag and show",
          "productPrice": "5",
          "proFrontIMAGE": "https://omarjbtbucket.s3.us-west-1.amazonaws.com/productB.jpg-1651137883823",
 "sellerId": "62470b37f2052b6a64637788",
          "qty": 2
        },
        
      ],
      
      
    ],
    "__v": 0
  }
]

这是我来自节点的代码示例

router.get("/orders", async (req, res) => {
  const { sellerID } = req.query;
  try {
    const order = await SellerOrder.find({
      sellerId: sellerID ,
    });
    res.status(200).json(order);
  } catch (error) {
    res.status(500).json(error + "error fetching data");
  }
});

Answer 1

对于过滤器，你可以试试嵌套的$elemMatch运算符，因为你的数据有嵌套数组，尝试聚合运算符在投影中过滤数组，您也可以在投影中添加所需的字段，

$reduce 迭代orderItem 的循环，将初始值设置为空白数组
$filter 迭代 first-level 数组的循环以检查 sellerId 和过滤数组
$concatArrays 将当前数组与过滤后的数组连接起来

const order = await SellerOrder.find({
  orderItem: {
    $elemMatch: {
      $elemMatch: {
        sellerId: sellerID
      }
    }
  }
},
{
  orderItem: {
    $reduce: {
      input: "$orderItem",
      initialValue: [],
      in: {
        $concatArrays: [
          {
            $filter: {
              input: "$$this",
              cond: {
                $eq: ["$$this.sellerId", sellerID]
              }
            }
          },
          "$$value"
        ]
      }
    }
  }
  // add other projection fields here
})

Playground

node mongoDb 根据key查询嵌套数组

node mongoDb query nested array based on key

mongodb

node.js