我有模型：type Book struct { gorm.Model Title string `json:"title"` Author string `json:"author"` Description string `json:"description"` Category string `json:"Category"` Publisher string `json:"publisher"` AuthorsCard []*AuthorsCard `gorm:"many2many:book_authorscard; "json:"authorscard"`}type AuthorsCard struct { gorm.Model Name string `json:"name"` Age int `json:"age"` YearOfBirth int `json:"year"` Biography string `json:"biography"`}在 db.AutoMigrate(&models.Book{}, &models.AuthorsCard{})我有一個創建函數：func TestCreate() { var testbook = models.Book{ Title: "Test", Author: "tst", AuthorsCard: []*models.AuthorsCard{ { Age: 23, Name: "test", YearOfBirth: 1999, Biography: "23fdgsdddTEST", }, }, Description: "something", } db.Preload("AuthorsCard").Find(&models.Book{}) db.Create(&testbook)}盡管 AuthorsCard 中有一些數據，但我收到了以下回復：{ "ID": 78, "CreatedAt": "2022-06-23T13:10:58.01629+03:00", "UpdatedAt": "2022-06-23T13:10:58.01629+03:00", "DeletedAt": null, "title": "Test", "author": "tst", "description": "something", "Category": "", "publisher": "", "authorscard": null }如您所見，“authorscard”為空。如何將“authorscard”保存到數據庫？我使用了 Gorm + postgresql 并且我用郵遞員發送了一些請求，結果是一樣的 - 作者卡是空的
1 回答
紫衣仙女
TA貢獻1839條經驗 獲得超15個贊
當以正確的順序調用代碼時，代碼可以正常工作：
func TestCreate() {
db := getDB()
db.AutoMigrate(&Book{}, AuthorsCard{})
var testbook = Book{
Title: "Test",
Author: "tst",
AuthorsCard: []*AuthorsCard{
{
Age: 23,
Name: "test",
YearOfBirth: 1999,
Biography: "23fdgsdddTEST",
},
},
Description: "something",
}
// 1. Create your testbook.
db.Create(&testbook)
// 2. Store it into a variable:
var b1 *Book
db.Preload("AuthorsCard").Find(&b1)
fmt.Println(b1.AuthorsCard[0].Age)
fmt.Println(b1.AuthorsCard[0].Name)
fmt.Println(b1.AuthorsCard[0].YearOfBirth)
fmt.Println(b1.AuthorsCard[0].Biography)
}
印刷：
23 測試 1999 23fdgsdddTEST
此外，您的 JSON 導出可能會失敗，因為您將指針傳遞給 AuthorCard 并且在這些情況下編組并不總是正常工作。然而，GORM 在這方面做得很好。
靜態檢查在這里也給了我一些提示：
type Book struct {
gorm.Model
Title string `json:"title"`
Author string `json:"author"`
Description string `json:"description"`
Category string `json:"Category"`
Publisher string `json:"publisher"`
AuthorsCard []*AuthorsCard `gorm:"many2many:book_authorscard" json:"authorscard"` // wrong space
}
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