func GetUserByAddress(db *periwinkle.Tx, medium string, address string) *User {
var o User
result := db.Joins("INNER JOIN user_addresses ON user_addresses.user_id=users.id").Where("user_addresses.medium=? and user_addresses.address=?", medium, address).Find(&o)
if result.Error != nil {
if result.RecordNotFound() {
return nil
}
dbError(result.Error)
}
o.populate(db)
return &o
}