如何查询包含数组MongoDB数组中某些元素的特定值的单个文档答案

【问题标题】：How to query single document which contains specific value of some element in array of arrays MongoDB如何查询包含数组MongoDB数组中某些元素的特定值的单个文档
【发布时间】：2016-11-22 00:25:05
【问题描述】：

我有一个包含数组数组的文档，我在 MongoDb 中使用嵌入式文档。假设我有集合名称 Orders 看起来像：-

"_id" : "HjPGrdkffg7dQPtiX",
    "ListOrdersResult" : [
        {
            "Orders" : {
                "Order" : [
                    {
                        "LatestShipDate" : "2016-01-13T18:29:59Z",
                        "OrderType" : "StandardOrder",
                        "PurchaseDate" : "2016-01-11T10:24:49Z",
                        "PaymentExecutionDetail" : {
                            "PaymentExecutionDetailItem" : {
                                "PaymentMethod" : "COD",
                                "Payment" : {
                                    "CurrencyCode" : "INR",
                                    "Amount" : "839.30"
                                }
                            }
                        },
                        "BuyerEmail" : "vccdbptpx2ssd74882@marketplace.amazon.in",
                        "AmazonOrderId" : "402-4031538-7451469",
                        "LastUpdateDate" : "2016-01-14T06:47:17Z",
                        "ShipServiceLevel" : "IN Exp Dom 2",
                        "NumberOfItemsShipped" : "1",
                        "OrderStatus" : "Shipped",
                        "SalesChannel" : "Amazon.in",
                        "ShippedByAmazonTFM" : "false",
                        "LatestDeliveryDate" : "2016-01-19T18:29:59Z",
                        "NumberOfItemsUnshipped" : "0",
                        "BuyerName" : "xyz",
                        "EarliestDeliveryDate" : "2016-01-13T18:30:00Z",
                        "OrderTotal" : {
                            "CurrencyCode" : "INR",
                            "Amount" : "839.30"
                        },
                        "IsPremiumOrder" : "false",
                        "EarliestShipDate" : "2016-01-11T18:30:00Z",
                        "MarketplaceId" : "A21TJRRWUN4KGVC",
                        "FulfillmentChannel" : "MFN",
                        "TFMShipmentStatus" : "Delivered",
                        "PaymentMethod" : "COD",
                        "ShippingAddress" : {
                            "StateOrRegion" : "HARYANA",
                            "City" : "GURGAON",
                            "Phone" : "9999999999",
                            "CountryCode" : "IN",
                            "PostalCode" : "122001",
                            "Name" : "Murthy",
                            "AddressLine1" : "House No. , J Block, Badshahpur"
                        },
                        "IsPrime" : "false",
                        "ShipmentServiceLevelCategory" : "Expedited"
                    },
                    {
                        "LatestShipDate" : "2016-01-13T18:29:59Z",
                        "OrderType" : "StandardOrder",
                        "PurchaseDate" : "2016-01-11T13:16:49Z",
                        "PaymentExecutionDetail" : {
                            "PaymentExecutionDetailItem" : {
                                "PaymentMethod" : "COD",
                                "Payment" : {
                                    "CurrencyCode" : "INR",
                                    "Amount" : "899.40"
                                }
                            }
                        },
                        "BuyerEmail" : "xyz@marketplace.amazon.in",
                        "AmazonOrderId" : "402-2142159-5087541",
                        "LastUpdateDate" : "2016-01-14T06:47:15Z",
                        "ShipServiceLevel" : "IN Exp Dom 2",
                        "NumberOfItemsShipped" : "1",
                        "OrderStatus" : "Cancel",
                        "SalesChannel" : "Amazon.in",
                        "ShippedByAmazonTFM" : "false",
                        "LatestDeliveryDate" : "2016-01-19T18:29:59Z",
                        "NumberOfItemsUnshipped" : "0",
                        "BuyerName" : "demo prakash",
                        "EarliestDeliveryDate" : "2016-01-13T18:30:00Z",
                        "OrderTotal" : {
                            "CurrencyCode" : "INR",
                            "Amount" : "899.40"
                        },
                        "IsPremiumOrder" : "false",
                        "EarliestShipDate" : "2016-01-11T18:30:00Z",
                        "MarketplaceId" : "A21TJEUUN4WGV",
                        "FulfillmentChannel" : "MFN",
                        "TFMShipmentStatus" : "Delivered",
                        "PaymentMethod" : "COD",
                        "ShippingAddress" : {
                            "StateOrRegion" : "DELHI",
                            "City" : "DELHI",
                            "Phone" : "99999999",
                            "CountryCode" : "IN",
                            "PostalCode" : "110038",
                            "Name" : "Demo prakash",
                            "AddressLine1" : "Hn 638 gali n 04 Wazirabad new delhi"
                        },
                        "IsPrime" : "false",
                        "ShipmentServiceLevelCategory" : "Expedited"
                    },
                    }
                ]
            },
            "CreatedBefore" : "2015-03-19T06:17:59Z"
        }
    ],
    "ResponseMetadata" : {
        "RequestId" : "cf94645e-ada7-4ec6-b161-a97d07a77817"
    },
    "seller_user_id" : "yg4e34ccodzf3GPR2",
}

如您所见，这是包含数组的全部数据的单个文档，我想从该订单数组中获取状态为取消的订单。

所以我已经使用了：-

var orderDetails = orders.find({"ListOrdersResult.Orders.Order":{$elemMatch: { OrderStatus:"Canceled"}}}).fetch();

我也试过：-

orders.find({"ListOrdersResult.Orders.Order.OrderStatus":'Canceled'}).fetch();

因此，这将返回包含已取消状态和其他状态的整个文档，但我只想从包含状态为待处理的文档中选择结果。

那么在 mongoDb 中是否有任何方法可以从包含嵌套数组数组作为对象的单个文档中查询选定的值。

或者我需要将值存储到 diff diff 文档中，这只是解决方案。

如有任何帮助，请提供帮助

谢谢！

【问题讨论】：

尝试使用 mongodb 的聚合。

标签： javascript arrays node.js mongodb meteor

【解决方案1】：

您可以使用任何流星聚合包。您可以使用 match 然后对数据进行分组，然后将其发送到客户端。Like ：

var ordersLines = orders.aggregate([
                      {$unwind : "$ListOrdersResult.Orders.Order"},
                      {$match : { OrderStatus:"Canceled"} },
                      {$project : {
                      OrderType : '$ListOrdersResult.Orders.Order.OrderType'
                      ....  
                           }
                      }
                  ]);
return ordersLines;

但我建议您使用不同的文档。

【讨论】：