模型Account
包含嵌套 struct -Currency
和User
当我在DB中创建一个Account
的新实例,然后在我的响应中返回它时,嵌套的实体为空:
type Account struct {
BaseModel
Name string `gorm:"size:64;not null" json:"name"`
Balance decimal.Decimal `gorm:"type:decimal(16, 2);default:0;not null;" json:"balance"`
UserID int `gorm:"not null" json:"-"`
User User `gorm:"foreignKey:UserID" json:"user"`
CurrencyID int `gorm:"not null" json:"-"`
Currency Currency `gorm:"foreignKey:CurrencyID" json:"currency"`
}
type CreateAccountBody struct {
Name string `json:"name" binding:"required"`
Balance decimal.Decimal `json:"balance"`
CurrencyID int `json:"currency_id" binding:"required"`
}
func CreateAccount(ctx *gin.Context) {
body := CreateAccountBody{}
if err := ctx.Bind(&body); err != nil {
log.Println("Error while binding body:", err)
ctx.JSON(
http.StatusBadRequest,
gin.H{"error": "Wrong request parameters"},
)
return
}
account := Account {
Name: body.Name,
Balance: body.Balance,
CurrencyID: body.CurrencyID,
UserID: 1,
}
if result := db.DB.Create(&account); result.Error != nil {
log.Println("Unable to create an account:", result.Error)
}
ctx.JSON(http.StatusCreated, gin.H{"data": account})
}
为了避免这个问题,我用单独的查询刷新了帐户变量:
db.DB.Create(&account)
db.DB.Preload("User").Preload("Currency").Find(&account, account.ID)
ctx.JSON(http.StatusCreated, gin.H{"data": account})
这是达到预期效果的最有效、最正确的方法吗?