Gorm Use interface as the model when Updates

Your Question

The following code works well in gorm v1.

type Object struct {
       ...
}

func (obj *Object) Scan(value interface{}) error {
    if value != nil {
        if e := json.Unmarshal(value.([]byte), r); e != nil {
            return e
        }
    }
    return nil
}

var face interface{}
var model Object{}
face = model

db.Model(face).Updates(...)

But in gorm v2, db.Model(face).Updates(...) will call the Scan() function, and panics with the following.

test panicked: interface conversion: interface {} is Object, not []uint8

I don't know why gormv2 calls Scan() when using interface as the model. And if I want to use interface as the model to support different structs, how can I do that? Thank you so much!

The document you expected this should be explained

Expected answer

Comment From: JiawenFan810

I think that Value() should be called before Scan(), but I didn't see it in the log stack.

Comment From: li-jin-gou

refer to - https://gorm.cn/docs/data_types.html - https://gorm.io/docs/serializer.html