Gorm Preload and Scan into a struct?

I created 2 model: User and Order. Assuming a one-to-many relationship between User and Order like the following:

type User struct {
    ID       uint
    Name     string
    Orders   []Order // Assuming a one-to-many relationship between User and Order
}

type Order struct{
   ID uint
   UserID uint
   User User
}

I created UserDTO for response data for Front End like the following:

type UserDTO{
    Name     string
    Orders   []Order
}

Then I want to preload Orders from User and scan query result to UserDTO:

var userDTO UserDTO

// Preload the "Orders" association and scan into the UserDTO struct
db.Model(&User{}).Preload("Orders").Where("id = ?", userID).Find(&userDTO)

With this query above it raise a error: invalid field found for struct UserDTO's field Orders: define a valid foreign key for relations or implement the Valuer/Scanner interface

I know I can do with the way:

var user User
db.Model(&User{}).Preload("Orders").Where("id = ?", userID).Find(&user)

and then convert user from User type to UserDTO type.

But I want to know that with previous way whether GORM can support and let me know how to fix the error above?

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