Redis: How to check redis error type

[mouhong]

Hey guys, go-redis will return an error if I HGet a hash field which doesn't exist.
But how do i distinguish this error with other errors like network error?
What i want to do is:

val, err := redis.HGet("hash", "not_exist_field")
if err.(???) {
   log.Println("ok, the field does not exist, make it default to 0")
} else {
   log.Println("some unknow error occurs, log it and return err to caller")
}

[vmihailenco]

You are probably looking for redis.Nil

[mouhong]

@vmihailenco Thanks! This is exactly what I'm looking for. Just wondering why making nil response an error instead of a normal return value?

[vmihailenco]

Like what?