英文:
Gorm read only field after create
问题
我需要在创建后将模型的一个属性设置为只读。我的代码可以正常工作，但是当我尝试更新时不会抛出任何错误。
请问你能帮我解决如何在更新时获取错误吗？
package mainimport ("fmt""gorm.io/gorm")type Product struct {gorm.ModelProductID int `gorm:"primaryKey"`Code string `gorm:"<-:create"`Price uint}// TestSuite 是所有测试的代码，与数据库无关func TestSuite(db *gorm.DB) { // 迁移模式db.AutoMigrate(&Product{})// 创建db.Create(&Product{Code: "D4222", Price: 1000, ProductID: 3})// 读取var product Productdb.First(&product, "product_id = ?", 3) // 查找 product_id 为 3 的产品fmt.Println("创建后的产品代码：", product.Code)fmt.Println("创建后的产品价格：", product.Price)// 更新err := db.Model(&product).Where("product_id = ?", 3).Updates(Product{Price: 400, Code: "F42"}).Errorif err != nil {fmt.Println(err)}// 更新后读取var updateProd Productdb.First(&updateProd, "product_id = ?", 3) // 查找 product_id 为 3 的产品fmt.Println("更新后的产品代码：", updateProd.Code)fmt.Println("更新后的产品价格：", updateProd.Price)// 删除 - 删除产品db.Unscoped().Delete(&updateProd, 3)}
输出：
创建后的产品代码：D4222
创建后的产品价格：1000
更新后的产品代码：D4222
更新后的产品价格：400
英文:
I need to make one of the property of model as read only after create.
My code in working but when I try to update It will not throw any error.
Could you please help me in how to get error when we try to Update?
package mainimport ("fmt""gorm.io/gorm")type Product struct {gorm.ModelProductID int `gorm:"primaryKey"`Code string `gorm:"->;<-:create"`Price uint}// TestSuite is code to all tests, independent of databasefunc TestSuite(db *gorm.DB) { // Migrate the schemadb.AutoMigrate(&Product{})// Createdb.Create(&Product{Code: "D4222", Price: 1000, ProductID: 3})// Readvar product Productdb.First(&product, "product_id = ?", 3) // find product with product_id 2fmt.Println("Product Code After Creation: ", product.Code)fmt.Println("Product Price After Creation: ", product.Price)//Updateerr := db.Model(&product).Where("product_id = ?", 3).Updates(Product{Price: 400, Code: "F42"}).Errorif err != nil {fmt.Println(err)}// Read after updatevar updateProd Productdb.First(&updateProd, "product_id = ?", 3) // find product with product_id 2fmt.Println("Product Code After Update: ", updateProd.Code)fmt.Println("Product Price After Update: ", updateProd.Price)// Delete - delete productdb.Unscoped().Delete(&updateProd, 3)}
Output:Product Code After Creation: D4222Product Price After Creation: 1000Product Code After Update: D4222Product Price After Update: 400
答案1
得分: 1
如果你的表还没有创建，那么你没有任何问题。
如果你的表已经创建，并且你想将模型的两个属性设置为只读，请按照以下步骤进行操作：
type Test struct {EnvID string `json:"env_id" gorm:"-"`PartID string `json:"part_id" gorm:"index:depl_part;unique;priority:3;-"`}
然后你需要运行以下代码：
err := Client.AutoMigrate(&Test{})
现在，EnvID和PartID属性是只读的，直到你从GORM中删除"->"并运行上述代码。
英文:
if your table not created you don't have any problem
if your table created and you wanna to make two of the property of model as read only following below:
type Test struct {EnvID string `json:"env_id" gorm:"->"`PartID string `json:"part_id" gorm:"index:depl_part;unique;priority:3;->"`}
then you must be to run following code
err := Client.AutoMigrate(&Test{})
now EnvID and PartID are READ-ONLY until you delete -> from GORM and run top code.
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