我正在嘗試創(chuàng)建一個采用接口而不是特定類型并調(diào)用 FindOne 函數(shù)的函數(shù)。有誰知道為什么 printFirstTrainerByInterface 函數(shù)不能正常工作？我正在使用官方的 Go Mongo-Driver 和來自mongodb-go-driver-tutorial 的示例片段。package mainimport (    "context"    "fmt"    "log"    "go.mongodb.org/mongo-driver/bson"    "go.mongodb.org/mongo-driver/mongo"    "go.mongodb.org/mongo-driver/mongo/options")type Trainer struct {    Name string    Age  int    City string}var db *mongo.Databasefunc main() {    opts := options.Client().ApplyURI("mongodb://localhost:27017")    client, err := mongo.Connect(context.TODO(), opts)    if err != nil {        log.Fatal(err)    }    err = client.Ping(context.TODO(), nil)    if err != nil {        log.Fatal(err)    }    db = client.Database("test")    insertTestDocument()    var result Trainer    printFirstTrainer(result)    var result2 Trainer    printFirstTrainerByInterface(&result2)}func insertTestDocument() {    ash := Trainer{"Ash", 10, "Pallet Town"}    res, err := db.Collection("trainers").InsertOne(context.TODO(), ash)    if err != nil {        log.Fatal(err)    }    fmt.Println("Inserted a test document: ", res.InsertedID)}func printFirstTrainer(result Trainer) {    collection := db.Collection("trainers")    err := collection.FindOne(context.TODO(), bson.M{}).Decode(&result)    if err != nil {        log.Fatal(err)    }    fmt.Printf("Found a single document: %+v\n", result)}func printFirstTrainerByInterface(result interface{}) {    collection := db.Collection("trainers")    err := collection.FindOne(context.TODO(), bson.M{}).Decode(&result)    if err != nil {        log.Fatal(err)    }    fmt.Printf("Found a single document: %+v\n", result)}輸出：Inserted a test document:  ObjectID("5e8216f74f41a13f01061d61")Found a single document: {Name:Ash Age:10 City:Pallet Town}Found a single document: [{Key:_id Value:ObjectID("5e8216f74f41a13f01061d61")} {Key:name Value:Ash} {Key:age Value:10} {Key:city Value:Pallet Town}]