[英]mongodb aggregate gets stringified and does nto work in nodejs
我正在使用 mongodb 聚合,我能够在 mongo shell 中编写聚合并对其进行测试,它运行良好。 但是,当我尝试在 Nodejs 方法中使其动态化并从前端传递值时,它什么也没显示。 我认为的原因是这个new ObjectId(YOUR ID IN STRING TYPE)
。 在我通过聚合执行 function 的那一刻,它会被触发并且new ObjectId
会被删除,因此它不会被匹配。 这是我在 mongo shell 中编写的工作汇总
db.ParcelStatus.aggregate([
{
$match: {
$or: [
{
"statusRepositoryId": new ObjectId("5dd7fa20dcfa9600152cc2d8")
},
{
"statusRepositoryId": new ObjectId("5dd7fa20dcfa9600152cc2dd")
},
{
"createdAt": {
"$gte": new Date("2020-05-01T18:59:59.001Z")
}
},
{
"createdAt": {
"$lte": new Date("2020-05-31T18:59:59.099Z")
}
}
]
}
},
{
"$lookup": {
"from": "Parcel",
"localField": "parcelId",
"foreignField": "_id",
"as": "parcel"
}
},
{
"$unwind": {
"path": "$parcel",
"preserveNullAndEmptyArrays": true
}
},
{
"$lookup": {
"from": "CustomerData",
"localField": "parcel.customerDataId",
"foreignField": "_id",
"as": "parcel.customerData"
}
},
{
"$unwind": "$parcel.customerData"
},
{
"$lookup": {
"from": "Customer",
"localField": "parcel.customerData.customerId",
"foreignField": "_id",
"as": "parcel.customerData.customer"
}
},
{
"$unwind": "$parcel.customerData.customer"
},
{
"$lookup": {
"from": "City",
"localField": "parcel.customerData.cityId",
"foreignField": "_id",
"as": "parcel.customerData.city"
}
},
{
"$unwind": "$parcel.customerData.city"
}
])
现在在 nodejs 中,这是我构建它的方式
let pipeline = [];
const matchObj = {
$match: { $or: [] },
};
filters.forEach((obj) => {
if (obj.key === "date") {
matchObj.$match.$or.push(
{ createdAt: { $gte: new Date(obj.values.from) } },
{ createdAt: { $lte: new Date(obj.values.to) } }
);
}
if (obj.key === "status_repository") {
if (
report.filters.find((x) => x.key === obj.key).selectionType === "single"
) {
matchObj.$match.$or.push({
statusRepositoryId: { $toObjectId: obj.values },
});
} else {
obj.values.forEach((id) => {
matchObj.$match.$or.push({ statusRepositoryId: { $toObjectId: id } });
});
}
}
});
pipeline.push(matchObj);
pipeline = [
...pipeline,
{
$lookup: {
from: "Parcel",
localField: "parcelId",
foreignField: "_id",
as: "parcel",
},
},
{
$unwind: {
path: "$parcel",
preserveNullAndEmptyArrays: true,
},
},
{
$lookup: {
from: "CustomerData",
localField: "parcel.customerDataId",
foreignField: "_id",
as: "parcel.customerData",
},
},
{ $unwind: "$parcel.customerData" },
{
$lookup: {
from: "Customer",
localField: "parcel.customerData.customerId",
foreignField: "_id",
as: "parcel.customerData.customer",
},
},
{ $unwind: "$parcel.customerData.customer" },
{
$lookup: {
from: "City",
localField: "parcel.customerData.cityId",
foreignField: "_id",
as: "parcel.customerData.city",
},
},
{
$unwind: "$parcel.customerData.city",
},
];
在nodejs中,这就是它在控制台中的显示方式
db.ParcelStatus.aggregate([
{
"$match": {
"$or": [
{
"statusRepositoryId": "5dd7fa20dcfa9600152cc2d8"
},
{
"statusRepositoryId":"5dd7fa20dcfa9600152cc2dd"
},
{
"createdAt": {
"$gte": "2020-05-01T18:59:59.001Z"
}
},
{
"createdAt": {
"$lte": "2020-05-31T18:59:59.099Z"
}
}
]
}
},
{
"$lookup": {
"from": "Parcel",
"localField": "parcelId",
"foreignField": "_id",
"as": "parcel"
}
},
{
"$unwind": {
"path": "$parcel",
"preserveNullAndEmptyArrays": true
}
},
{
"$lookup": {
"from": "CustomerData",
"localField": "parcel.customerDataId",
"foreignField": "_id",
"as": "parcel.customerData"
}
},
{
"$unwind": "$parcel.customerData"
},
{
"$lookup": {
"from": "Customer",
"localField": "parcel.customerData.customerId",
"foreignField": "_id",
"as": "parcel.customerData.customer"
}
},
{
"$unwind": "$parcel.customerData.customer"
},
{
"$lookup": {
"from": "City",
"localField": "parcel.customerData.cityId",
"foreignField": "_id",
"as": "parcel.customerData.city"
}
},
{
"$unwind": "$parcel.customerData.city"
}
])
请注意 nodejs 中的差异导致$match
、 new Date(DATE)
和new ObjectId(ID)
。 如果您能告诉我如何解决此问题,我将不胜感激。
来自$match文档:
$match 查询语法与读操作查询语法相同; 即 $match 不接受原始聚合表达式。 要在 $match 中包含聚合表达式,请使用 $expr 查询表达式:
什么是原始聚合表达式?
表达式可以包括字段路径、文字、系统变量、表达式对象和表达式运算符。 表达式可以嵌套。
在我们的上下文中$toObjectId
是一个聚合表达式运算符,这意味着我们不能在$match
使用它而不使用$expr ,如下所示:
db.collection.aggregate([
{
$match: {
$expr: {
$eq: [
"$statusRepositoryId",
{
$toObjectId: "5dd7fa20dcfa9600152cc2d8"
}
]
}
}
}
])
这意味着您将不得不重新构建您的查询,这可能会很烦人。 但我们确实有更好的解决方案,只需从 Mongo 导入ObjectId
并在构造查询时将字符串转换为该字符串:
if (obj.key === "status_repository") {
if (
report.filters.find((x) => x.key === obj.key).selectionType === "single"
) {
matchObj.$match.$or.push({
statusRepositoryId: new ObjectId(obj.values),
});
} else {
obj.values.forEach((id) => {
matchObj.$match.$or.push({ statusRepositoryId: new ObjectId(id) });
});
}
}
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