Unfortunately, things aren't always that easy. One of the problems with TW
list filters is that they sometimes produce results one at a time, rather
than as a title list. Many of the convenient operators (like sum) that we
would like to use, on the other hand, often want to see a title list. In
this case, you can't grab all the values out of a data tiddler -- you have
to enumerate them one by one, and then pack them into something that can be
turned back into a title list. The trick here is to do the enumeration in a
macro, wikify that macro, and then split the results. If that seems like a
lot of extra steps, it's only because ... it is.
Anyway, this seems to work.
Good luck!
\define sumlist() <$list filter="[all[current]indexes[]]" variable="index"
>{{{ [all[current]getindex<index>] }}},</$list>
<table>
<th>Idea</th><th>Vote Count</th><th>Sum</th><th>Avg Score</th>
<$list filter="[tag<currentTiddler>]">
<tr>
<td>{{!!title}}</td>
<$list filter="[all[current]indexes[]count[]]" variable="count">
<$wikify name="sumlist" text="""<<sumlist>>""">
<$list filter="[<sumlist>split[,]sum[]]" variable="sum">
<$list filter="[<sum>divide<count>]" variable="avg">
<td><<count>></td>
<td><<sum>></td>
<td><<avg>></td>
</$list>
</$list>
</$wikify>
</$list></tr>
</$list>
</table>
On Thursday, January 2, 2020 at 6:34:12 AM UTC-8, Stobot wrote:
>
> Hello All,
>
> I must be missing easy, but is there a way to easily reference the values
> of data tiddlers within filter notation? I'm trying to build a 'voting'
> mechanism for my multi-user wiki. My initial thought would be do have each
> "item to be voted on" as a data tiddler, and store the "score" under their
> username, so that I can tell how many people voted, and what the average
> score was. Each data tiddler would be tagged with the name of the vote.
>
> So, I have for instance a data tiddler named "Idea 1", "Idea 2", "Idea 3"
> and so on. "Idea 1" would look like:
> User A:1
> User B:2
> User C:2
> User D:3
> User E:1
> etc.
>
> Each data tiddler would be tagged "Vote on this" or something. Here's my
> code so far for the "Vote on this" tiddler:
>
> <table>
> <th>Idea</th><th>Vote Count</th><th>Avg Score</th>
> <$list filter="[tag<currentTiddler>]">
> <tr>
> <td>{{!!title}}</td>
> <td><$list filter="[all[current]indexes[]count[]]"></$list></td>
> <td><$list filter="[all[current]indexes[]get[value]] +sum[]]">
> </$list></td>
> </tr>
> </$list>
> </table>
>
> The line with the get[value] +sum[] is where I'm stuck. Obviously sum
> doesn't get me all the way to average, but sum/count will work once I
> figure out the reference part.
>
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