MongoDB BulkWrite 更新操作 $set 不工作

Question

我正在通过对每个产品执行 bulkWrite updateOne 操作来遍历产品（变量记录）。

更新记录后，我可以看到预订数组被添加到文档中，totalQuantity 更新为预期值（例如：如果 totalQuantity 为 2000，loadingTotal 为 600，则更新后的 totalQuantity 为 1400）

正如您在 $set: { currentQuantity: "$totalQuantity" } 行中看到的，我正在尝试将 totalQuantity(1400) 分配给 currentQuantity。但这不起作用。

for (const el of records) {
        promiseArray.push(
          Stock.bulkWrite(
            [
              {
                updateOne: {
                  filter: {
                    index: el.index,
                    product: el.product,
                    batchNo: el.batchNo,
                    agency,
                    totalQuantity: { $gte: el.loadingTotal },
                  },
                  update: {
                    $push: {
                      reservations: {
                        loadingSheetId: sheetAfterSave._id,
                        reservedCaseQuantity: el.loadingCaseCount,
                        reservedUnitQuantity: el.loadingUnitCount,
                        reservedTotalQuantity: el.loadingTotal,
                      },
                    },
                    $inc: { totalQuantity: -el.loadingTotal },
                    $set: { currentQuantity: "$totalQuantity" } // Issue
                  },
                },
              },
            ],
            { session: session }
          )
        );
      }

  const result = await Promise.all(promiseArray);
  console.log('******** Result Promise ********', result);

知道如何解决这个问题吗？？

错误信息

[distribution] CastError: Cast to Number failed for value "$totalQuantity" at path "currentQuantity"
[distribution]     at SchemaNumber.cast (/app/node_modules/mongoose/lib/schema/number.js:384:11)
[distribution]     at SchemaNumber.SchemaType.applySetters (/app/node_modules/mongoose/lib/schematype.js:1031:12)
[distribution]     at SchemaNumber.SchemaType._castForQuery (/app/node_modules/mongoose/lib/schematype.js:1459:15)
[distribution]     at SchemaNumber.castForQuery (/app/node_modules/mongoose/lib/schema/number.js:436:14)
[distribution]     at SchemaNumber.SchemaType.castForQueryWrapper (/app/node_modules/mongoose/lib/schematype.js:1428:15)
[distribution]     at castUpdateVal (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:520:19)
[distribution]     at walkUpdatePath (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:347:22)
[distribution]     at castUpdate (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:94:7)
[distribution]     at /app/node_modules/mongoose/lib/helpers/model/castBulkWrite.js:70:37
[distribution]     at /app/node_modules/mongoose/lib/model.js:3502:35
[distribution]     at each (/app/node_modules/mongoose/lib/helpers/each.js:11:5)
[distribution]     at /app/node_modules/mongoose/lib/model.js:3502:5
[distribution]     at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5
[distribution]     at new Promise (<anonymous>)
[distribution]     at promiseOrCallback (/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)
[distribution]     at Function.Model.bulkWrite (/app/node_modules/mongoose/lib/model.js:3500:10) {
[distribution]   stringValue: '"$totalQuantity"',
[distribution]   messageFormat: undefined,
[distribution]   kind: 'Number',
[distribution]   value: '$totalQuantity',
[distribution]   path: 'currentQuantity',
[distribution]   reason: AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:
[distribution]
[distribution]     assert.ok(!isNaN(val))
[distribution]
[distribution]       at castNumber (/app/node_modules/mongoose/lib/cast/number.js:28:10)
[distribution]       at SchemaNumber.cast (/app/node_modules/mongoose/lib/schema/number.js:382:12)
[distribution]       at SchemaNumber.SchemaType.applySetters (/app/node_modules/mongoose/lib/schematype.js:1031:12)
[distribution]       at SchemaNumber.SchemaType._castForQuery (/app/node_modules/mongoose/lib/schematype.js:1459:15)
[distribution]       at SchemaNumber.castForQuery (/app/node_modules/mongoose/lib/schema/number.js:436:14)
[distribution]       at SchemaNumber.SchemaType.castForQueryWrapper (/app/node_modules/mongoose/lib/schematype.js:1428:15)
[distribution]       at castUpdateVal (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:520:19)
[distribution]       at walkUpdatePath (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:347:22)
[distribution]       at castUpdate (/app/node_modules/mongoose/lib/helpers/query/castUpdate.js:94:7)
[distribution]       at /app/node_modules/mongoose/lib/helpers/model/castBulkWrite.js:70:37
[distribution]       at /app/node_modules/mongoose/lib/model.js:3502:35
[distribution]       at each (/app/node_modules/mongoose/lib/helpers/each.js:11:5)
[distribution]       at /app/node_modules/mongoose/lib/model.js:3502:5
[distribution]       at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5
[distribution]       at new Promise (<anonymous>)
[distribution]       at promiseOrCallback (/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10) {
[distribution]     generatedMessage: true,
[distribution]     code: 'ERR_ASSERTION',
[distribution]     actual: false,
[distribution]     expected: true,
[distribution]     operator: '=='
[distribution]   }
[distribution] }

没有运气。

以下示例来自 mongo 官方文档

{ "_id" : 1, "name" : "A", "hours" : 80, "resources" : 7 },
{ "_id" : 2, "name" : "B", "hours" : 40, "resources" : 4 }

db.planning.aggregate(
   [
     { $project: { name: 1, workdays: { $divide: [ "$hours", 8 ] } } }
   ]
)

{ "_id" : 1, "name" : "A", "workdays" : 10 }
{ "_id" : 2, "name" : "B", "workdays" : 5 }

使用 $hours 表示 2 个文档中的动态值。但在我的情况下，“$totalQuantity”不起作用

https://docs.mongodb.com/manual/reference/operator/aggregation/divide/

Answer 1

问题是您试图在此行中存储“$totalQuantity”的文本而不是数值：

$set: { currentQuantity: "$totalQuantity" }

取而代之的是一个硬编码的数值

$set: { currentQuantity: 5 }

将值设置为 5。现在，您需要找出动态值是什么。如果您有一个以数字为值的 $totalQuantity 变量，那么您可以执行以下操作：

$set: { currentQuantity: $totalQuantity }

如果没有，那么您将需要弄清楚如何访问您需要的价值并使用这些知识来访问它。

Answer 2

Prasad_Saya

嗨@Shanka_Somasiri，我不确定你在尝试什么。例如，以下是使用聚合管道进行更新的方法。

我有一个输入文档：

{
   _id: 1,
   reservations: [ ]
}

这是我要推送到预订数组中的文档。

var docToUpdate = { loadingShetId: 12, reservedCaseQty: 200 }

更新查询：

db.test.updateOne(
  { _id: 1 },
  [
    {
         $set: {
             reservations: {
                 $concatArrays: [ "$reservations", [ docToUpdate ] ]
             }
         }
    }
  ]
)

更新的文档：

{
        "_id" : 1,
        "reservations" : [
                {
                        "loadingShetId" : 12,
                        "reservedCaseQty" : 200
                }
        ]
}

剩余字段更新：

$inc: { totalQuantity: -el.loadingTotal }
$set: { currentQuantity: "$totalQuantity" }

可编码如下：

totalQuantity: { $add: [ "$totalQuantity", -el.loadingTotal ] }
currentQuantity: "$totalQuantity"

所以，更新查询会变成：

db.test.updateOne(
  { _id: 1 },
  [
    {
         $set: {
             reservations: {
                 $concatArrays: [ "$reservations", [ docToUpdate ] ]
             },
             totalQuantity: { $add: [ "$totalQuantity", -el.loadingTotal ] },
             currentQuantity: "$totalQuantity"
         }
    }
  ]
)