Gorm Association mode create

Your Question

I have 2 structs: Aa struct has many B structs. I want to create multiple B records by using association mode create. It works fine with gorm.io/driver/mysql v1.2.0 and gorm.io/gorm v1.22.3. However, with gorm.io/driver/mysql v1.3.5 and gorm.io/gorm v1.23.8, it will create only one B record.

The following is my code snippet.

package main

import (
    "fmt"
    "log"

    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

type Aa struct {
    AID string `gorm:"primaryKey"`
    Bs  []B    `gorm:"foreignKey:AID;references:AID"`
}

type B struct {
    AID string `gorm:"index"`
    BID string
}

func initDB(dbHost, dbName, dbPort, dbUser, dbPassword string) (*gorm.DB, error) {
    // connect to db
    dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local", dbUser, dbPassword, dbHost, dbPort, dbName)
    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{DryRun: true})
    if err != nil {
        return nil, fmt.Errorf("failed to open DB with DSN %s: %v", dsn, err)
    }
    return db, nil
}

func main() {
    db, err := initDB("localhost", "test", "3306", "root", "")
    if err != nil {
        log.Fatalf("failed to init db: %v", err)
    }

    bs := []B{
        {
            AID: "aid",
            BID: "bid1",
        },
        {
            AID: "aid",
            BID: "bid2",
        },
    }
    a := Aa{
        AID: "aid",
        Bs:  bs,
    }
    if err := db.Create(a).Error; err != nil {
        log.Fatalf("failed to create records: %v", err)
    }
}

The document you expected this should be explained

https://gorm.io/docs/associations.html#Auto-Create-x2F-Update

Expected answer

I suppose it would create multiple B records for me

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