[英]Golang mongodb aggregation using mongo-driver
I'm trying to perform the following Mongo query in Golang using mongo-driver:我正在尝试使用 mongo-driver 在 Golang 中执行以下 Mongo 查询:
var currentDate = ISODate("2021-01-22T00:00:00Z")
var someValue = "A"
db.someCollection.aggregate([
{$match: {"data.date": currentDate, someAttribute: someValue}},
{$project: {
data: {$filter: {
input: '$data',
as: 'df',
cond: {$eq: ['$$df.date', currentDate]}
}},
_id: 0
}}
])
I have tried the following without much luck:我尝试了以下方法,但运气不佳:
currentDate := time.Date(2021, 1, 22, 0, 0, 0, 0, time.UTC)
someValue := "A"
matchStage := bson.D{{"$match", bson.D{{"data.date", currentDate}, {"someAttribute", someValue}}}}
projectStage := bson.D{{"$project", bson.D{{"data", bson.D{{"$filter", bson.D{{"input", "'$data'"}, {"as", "df"}, {"cond", bson.D{{"eq", bson.A{"$$df.date", currentDate}}}}}}}}}}}
cur, err := someCollection.Aggregate(a.ctx, mongo.Pipeline{matchStage, projectStage})
Getting following error: input to $filter must be an array not string
出现以下错误: input to $filter must be an array not string
How do I fix this?我该如何解决?
Answering my own question, it might be helpful for anyone facing this issue later.回答我自己的问题,这可能对以后遇到此问题的人有所帮助。
Here is what I did:这是我所做的:
currentDate := time.Date(2021, 1, 22, 0, 0, 0, 0, time.UTC)
someValue := "A"
matchStage := bson.D{{"$match", bson.D{{"data.date", currentDate}, {"someAttribute", someValue}}}}
projectStage := bson.D{
{"$project", bson.D{
{"_id", 0},
{"data", bson.D{
{"$filter", bson.D{
{"input", "$data"},
{"as", "df"},
{"cond", bson.D{
{"$eq", bson.A{"$$df.date", currentDate}},
}},
}},
},
}},
},
}
I added the _id also I removed the single quote around $data我添加了 _id 还删除了 $data 周围的单引号
Cheers干杯
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