MongoDb聚合脚本，每个客户返回前10名

Question

我编写了一个脚本，它将交易展开到订单项，然后按产品汇总，以及产品销售额的总和数量和总收入。然后我通过partyuuid（公司）和itemTotalQuantity应用排序。

我的问题是，我如何才能使每个公司，我只获得十大畅销产品？我已经应用了这种类型，每个partyuuid我只需要10个产品。感谢

db.testCanonical.aggregate(
{ $match : {
   objectClass: "Goods & Services Transaction"
  ,objectCategory: "Sales"
  ,objectType: "Transaction"
//     , transactionDate.objectTransactionDate: {$gt: "2016-05-01T12:00:00.000Z", $lt: "2016-05-17T12:00:00.000Z"}
}
  },
{ $project: {_id: 1,partyuuid: 1,objectOrigin: 1,goodsAndServices: 1}},
{ $unwind: "$goodsAndServices" }
,
{$group: {
 _id: {
      partyuuid: "$partyuuid"
    , objectOrigin: "$objectOrigin"
    , itemName : "$goodsAndServices.itemName"
    }
    , "itemTotalQuantity":   {$sum: "$goodsAndServices.itemQuantity"}
    ,"itemGrossTotalValue": {$sum: "$goodsAndServices.itemTotalPrice"}
 }},
{
$project: {
    "_id":0,
    partyuuid: "$_id.partyuuid",
    itemName:"$_id.itemName",
    objectOrigin: "$_id.objectOrigin",
    itemTotalQuantity: "$itemTotalQuantity",
    itemGrossTotalValue: "$itemGrossTotalValue"
}
},
{$sort:{partyuuid: 1, itemTotalQuantity: -1}}
//,{$limit: 5}
//,{$out: "entity_datapoints"}
)

如果您需要此脚本正在处理的文档副本，请与我们联系。再次感谢

根据要求，请参阅以下商品＆amp;上述代码适用的服务交易。

{
"_id" : ObjectId("5738fcff1a21db15b5c45b4b"),
"objectClass" : "Goods & Services Transaction",
"objectCategory" : "Sales",
"objectType" : "Transaction",
"objectOrigin" : "kounta",
"objectOriginCategory" : "Point of Sale",
"partyuuid" : "KountaPartyUUIDGoesHere",
"connectionuuid" : "5738fc661a21db15b5c45b49",
"objectTransactionDate" : ISODate("2016-05-16T04:03:56.201Z"),
"objectLastUpdated" : ISODate("2016-05-16T04:04:29.201Z"),
"objectCreationDate" : ISODate("2016-05-15T22:49:35.665Z"),
"statuses" : {
    "objectTransactionStatus" : "COMPLETE"
},
"goodsAndServices" : [ 
    {
        "itemIdentifier" : 2143460.0000000000000000,
        "itemName" : "Cappuccino",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143460.0000000000000000,
        "itemName" : "Cappuccino",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143460.0000000000000000,
        "itemName" : "Cappuccino",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143460.0000000000000000,
        "itemName" : "Cappuccino",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Espresso",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Espresso",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Espresso",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Espresso",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Flat White",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Flat White",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Flat White",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Long Black",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Macchiato",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 2.6099999999999999,
        "itemTotalPrice" : 2.6099999999999999,
        "itemTaxTotal" : 0.3900000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Mocha",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }, 
    {
        "itemIdentifier" : 2143470.0000000000000000,
        "itemName" : "Mocha",
        "itemQuantity" : 1,
        "itemUnitNettPrice" : 3.4800000000000000,
        "itemTotalPrice" : 3.4800000000000000,
        "itemTaxTotal" : 0.5200000000000000
    }
],
"transactionGrossTotal" : 70,
"transactionTotalPayments" : 70,
"payments" : [ 
    {
        "paymentMethod" : "Cash",
        "paymentAmount" : 70,
        "paymentExtras" : 0,
        "paymentDate" : "2016-05-15T22:49:26+00:00"
    }
],
"party" : {
    "customer" : {},
    "staff" : {
        "staffid" : 53810
    }
},
"resources" : {
    "device" : {
        "deviceId" : 1031390.0000000000000000
    },
    "location" : {
        "locationId" : 25052
    }
}
}