Gorm Why set "db.Statement.Joins = nil" when query ?

in file: callbacks/query.go

192         db.Statement.Joins = nil

I have 2 models:

type User struct {
    models.Base
    NickName string
}
type Order struct {
    models.Base
    UserId int64
    User   User
}

I use join like this:

    var order Order
    db, _ := gorm.Open(mysql.Open(app.Config.Mysql.Connection), &gorm.Config{})

    tx := db.Joins("User")
    tx.Where("User.nick_name = ?", "bin")

    var count int64
    tx.Model(order)
    tx.Count(&count)
    tx.Find(&order)

    fmt.Println("name:", order.User.NickName)
    fmt.Println("count:", count)

I want to get both count and data, But I found order.User is empty. I check the code, and found after called tx.Count(&count), db.Statement.Joins will be set to nil. so tx.Find(&order) can't set association data.

So why set "db.Statement.Joins = nil", if delete this code will have any problems?

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