具有单表继承“类型”列的Gorm（Golang）和数据库

I'm experimenting with using Go to read from a database that's been part of an existing Rails app. A few of the models and therefore tables use single table inheritance via a type column. In Rails/ActiveRecord, the presence of this column will create an automatic mapping to the appropriate model. If the table is animals and type is Dog, it will map to the Dog class; if it's Cat, it'll map to the Cat class. I want to setup something similar in Gorm.

Since it doesn't seem like Gorm has a default_scope option for a model, I'm using a new callback.

func scopedSearch(scope *gorm.Scope) {
    tablename := scope.TableName()
    switch tablename {
    case "table_using_sti":
        scope.Search.Where("type = ?", "MyModelName")
    default:
        return
    }
}

And then I register the callback in my main function:

db.Callback().Query().Before("gorm:query").Register("my_plugin:before_query", scopedSearch)

When I search against an instance using db.First or the model using db.Model(&MyModel{}).Where(...), it appears to be working. Is this the right way to handle it? Will this scope be respected by all of the query methods or is there something more direct or thorough?