英文:
How to handle data from MongoDB document with Golang?
问题
我使用FindOne()获取到了一个文档。
这是在golang中表示文档的方式：
map[
_id:ObjectID("12")
chatID:12
expenses:[
map[amount:12 category:food]
map[amount:14 category:food]
]
income:[]
]
这是在MongoDB Atlas中的表示方式：
{
"_id":{"$oid":"12"},
"chatID":{"$numberInt":"12"},
"expenses":[
{"category":"food","amount":{"$numberDouble":"12.0"}},
{"category":"food","amount":{"$numberDouble":"14.0"}}
],
"income":[]
}
如何逐行处理这些数据？例如，如何打印每个支出的类别和金额？
英文:
I get document with FindOne()
This is how document is presented in the golang:
map[
_id:ObjectID("12")
chatID:12
expenses:[
map[amount:12 category:food]
map[ amount:14 category:food]]
income:[]]
This is how in MongoDB Atlas:
{"_id":{"$oid":"12"},
"chatID":{"$numberInt":"12"},
"expenses":[
{"category":"food","amount":{"$numberDouble":"12.0"}},
{"category":"food","amount":{"$numberDouble":"14.0"}}],
"income":[]}
How to work with each line separately? For example, how to print category and amount of every expense?
答案1
得分: 2
以下是翻译好的内容：
type List struct {
Category string `bson:"category"`
Amount float32 `bson:"amount"`
}
type Document struct {
ID primitive.ObjectID `bson:"_id,omitempty"`
ChatID int `bson:"chatID"`
Expenses []List `bson:"expense"`
Income []List `bson:"income"`
}
myDoc := Document
client.Collection.FindOne(context.TODO(), bson.D{}).Decode(&myDoc)
英文:
type List struct {
Category string `bson:"category"`
Amount float32 `bson:""amount"`
}
type Document struct {
ID primitive.ObjectID `bson:"_id, omitempty"`
ChatID int `bson:"chatID"`
Expenses []List `bson:"expense"`
Income []List `bson:"income"`
}
myDoc := Document
client.Collection.FindOne(context.TODO(), bson.D{}).Decode(&myDoc)
答案2
得分: 0
你需要一个用于这个MongoDB文档的结构体：
type Fulfillment struct {
Id primitive.ObjectID `bson:"_id"`
ChatID int64 `bson:"chatID"`
Expenses []map[string]interface{} `bson:"expenses"`
}
如果你使用MongoDB官方库：
var fulfillment Fulfillment
err = client.Database("test_data").Collection("fulfillment").FindOne(ctx, bson.M{"chatID": 100000000012}).Decode(&fulfillment)
if err != nil {
log.Fatal(err)
}
fmt.Printf("%d\n", fulfillment.ChatID)
fmt.Printf("%s\n", fulfillment.Id.Hex())
for _, expensive := range fulfillment.Expenses {
for k, v := range expensive {
switch v.(type) {
case string:
fmt.Printf("%s: %s \n", k, v)
case float64:
fmt.Printf("%s: %f \n", k, v)
}
}
}
希望能帮到你。
英文:
You need a struct for this MongoDB document:
type Fulfillment struct {
Id primitive.ObjectID `bson:"_id"`
ChatID int64 `bson:"chatID"`
Expenses []map[string]interface{} `bson:"expenses"`
}
if you use MongoDB official library:
var fulfillment Fulfillment
err = client.Database("test_data").Collection("fulfillment").FindOne(ctx, bson.M{"chatID": 100000000012}).Decode(&fulfillment)
if err != nil {
log.Fatal(err)
}
fmt.Printf("%d\n", fulfillment.ChatID)
fmt.Printf("%s\n", fulfillment.Id.Hex())
for _, expensive := range fulfillment.Expenses {
for k, v := range expensive {
switch v.(type) {
case string:
fmt.Printf("%s: %s \n", k, v)
case float64:
fmt.Printf("%s: %f \n", k, v)
}
}
}
I hope I've helped
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