Gorm How do I get Preload with Select to work?

My two types are below. I would like to return the user plus its known last latitude and longitude and nothing else. However, I am struggling to do this and the best I have right now is the following that returns everything in the embedded location.

database.DB.Debug().Preload("Locations").Where("user_id = ?", uid).Find(&familiars)

How do I get this to work properly? All attempts to select from the location object are just producing null.

type Location struct {
    gorm.Model
    UserID string    `json:"userId"`
    User   User  `gorm:"foreignKey:userID;references:Id"`
    Latitude   float64   `json:"latitude"`
    Longitude  float64   `json:"longitude"`
    RecordedAt time.Time `json:"recordedAt,omitempty"`
}

type User struct {
    gorm.Model
    Id       string    `gorm:"type:uuid;primaryKey" json:"id"`
    Name     string    `json:"name"`
    Email    string    `json:"email;unique"`
    Locations               []Location `json:"locations"`
}

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