Gorm Read Only Fields

How to create read only Fields

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Expected answer

type Product struct {
    gorm.Model
    ProductID int    gorm:"primaryKey"
    Code      string gorm:"->"
    Price     uint   gorm:"->"
}

// TestSuite is code to all tests, independent of database
func TestSuite(db *gorm.DB) { // Migrate the schema
    db.AutoMigrate(&Product{})

    // Create
    db.Debug().Create(&Product{Code: "D42", Price: 100, ProductID: 1})

    // Read
    var product Product
    //  db.Debug().First(&product, 1)                   // find product with integer primary key
    db.Debug().First(&product, "product_id = ?", 1) // find product with code D42

    // Update - update product's price to 200
    err := db.Debug().Model(&product).Update("Price", 200).Error
    if err != nil {
        fmt.Println(err.Error())
    }
    // Update - update multiple fields
    err = db.Debug().Model(&product).Updates(Product{Price: 200, Code: "F42"}).Error // non-zero fields
    if err != nil {
        fmt.Println(err.Error())
    }

    db.Debug().First(&product, "product_id = ?", 1)
    err = db.Debug().Model(&product).Updates(map[string]interface{}{"Price": 200, "Code": "F42"}).Error
    if err != nil {
        fmt.Println(err.Error())
    }
    // Delete - delete product
    db.Debug().Delete(&product, 1)
}

This one should raise error on update.

Comment From: a631807682

This needs to be handled by yourself. In addition to the fields declared in updates, we also need to handle with custom hooks and custom type fields. We decide on behalf of the user whether to report an error or not.