GORM：一个表的两个外键

要使用另一个 struct 作为外键，您应该将它的id作为另一个字段添加到目标 struct 中，对于您的 case ，这里是工作示例(使用gorm example):

package main

import (
    "log"
    "time"

    "gorm.io/driver/sqlite"
    "gorm.io/gorm"
)

type User struct {
    gorm.Model
    ID       uint64 `gorm:"primarykey"`
    TGtag    string
    IsActive bool
}

type RCEvent struct {
    gorm.Model
    ID          uint64 `gorm:"primarykey"`
    DateStarted time.Time
    IsActive    bool
}

type Pair struct {
    gorm.Model
    ID      uint64 `gorm:"primarykey"`
    EventID uint64
    Event   RCEvent
    User1ID uint64
    User1   User
    User2ID uint64
    User2   User
}

func main() {
    db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
    if err != nil {
        panic("failed to connect database")
    }

    // Migrate the schema
    err = db.AutoMigrate(&User{})
    if err != nil {
        log.Fatal(err)
    }
    err = db.AutoMigrate(&RCEvent{})
    if err != nil {
        log.Fatal(err)
    }
    err = db.AutoMigrate(&Pair{})
    if err != nil {
        log.Fatal(err)
    }

    // Create
    user1 := User{ID: 2, TGtag: "mohammad"}
    user2 := User{ID: 3, TGtag: "ali"}
    event := RCEvent{ID: 2}
    pair := Pair{ID: 2, EventID: 2, Event: event, User1ID: 2, User1: user1, User2ID: 3, User2: user2}
    db.Create(&user1)
    db.Create(&user2)
    db.Create(&event)
    db.Create(&pair)

    // Read
    var user User
    db.First(&user, 3)                   // find product with integer primary key
    db.First(&user, "t_gtag = ?", "ali") // find product with code D42

    // Update - update product's price to 200
    db.Model(&user).Update("is_active", false)
    // Update - update multiple fields
    db.Model(&user).Updates(User{ID: 4, TGtag: "ahmad"}) // non-zero fields
    db.Model(&user).Updates(map[string]interface{}{"Id": 5, "TGtag": "hasan"})

    // Delete - delete product
    db.Delete(&user, 2)
}