Q: dynamic playlist of unrated songs

[Aran Cox]

On Mon, Jun 29, 2009 at 9:18 AM, D. R. Evans<doc.evans at gmail.com> wrote:
> Ben K said the following at 06/28/2009 07:22 PM :
>> Actually the last time I looked at the source, an unrated song IS the same
>> as a zero rating. The DB stores unrated songs' rating as zero, but it should
>> probably be null. If people are happy for this to change I'll see if I can
>> write a patch tonight.
>
> Yes; it is conceptually completely different to say "I have formed no
> opinion about this song" than to say "My opinion of this song is that is
> worthless".
>
> Reading later in this thread, I am astounded that there is any debate about
> this. The concepts are totally different.
>
> For example, If I ask "What is the cardinality of set X?" then the answer
> "zero" is profoundly different from the answer "I don't know".
>
> (Or to give an example closer to home: if someone asks me "How many people
> use amarok?", would the answer "zero" be acceptable?)
>
> So, no matter how it is implemented, there should be a way to distinguish a
> zero rating from "unrated".
>
> I thought that was what the <blank> option was intended to do when
> filtering according to rating, but apparently that's not so. It's not at
> all obvious what the <blank> option is there for.
>
>  Doc
>

Is there a way to assign a zero rating?  If not then 0=unrated for all
intents and purposes.  If you want to rate the worst song you've ever
heard give it 1/2 star (presumably for effort, if not execution.)
Although I do understand the logic of undefined vs. 0 from a practical
standpoint there is little difference.