Hi Tobias,
I'm not sure but to me this problem looks similar to this one:
https://groups.google.com/forum/#!msg/tiddlywiki/h0bBO54Qn7g/8xWaAYlXBAAJ,
for which you proposed this:
https://github.com/Jermolene/TiddlyWiki5/issues/2078.
Assuming the new operator |some-field:any-listitem<item-list>| exists,
isn't it possible to write the condition using a single filter? It would
be something similar to:
|[tag[star_system]field:quadrant[Alpha
Quadrant]listed[solar_system]tag[planet]]
|
... except with the new operator that I don't know how to use instead of
"listed" :-)
Am I completely wrong? (a real possibility here)
Erwan
On 19/11/15 16:08, Tobias Beer wrote:
Hi David,
Actually, I have another question.
How would I compile the results of the internal list into a single
list,
rather than separate lists for every element in the parent list?
I'd be glad to learn I'm wrong, but I don't think that's currently
possible.
One way to eventually implement this could be to create a new *filter*
filter
which would run a given filter expression against the input set,
which in your case could look like so:
|
<$set name="planets-in-system"
value="[tag[planet]field:solar_system<this_system>]">
{{{ [tag[star_system]field:quadrant[Alpha
Quadrant]filter:this_system<planets-in-system>]] }}}
</$set>
|
So, what would this do?
1. define a variable called *planets-in-system* specifying a filter
expression using a variable called *this_system*
2. evaluate this filter expression against the titles fetched as
*star_system* in the *Aplha Quadrant*
* while replacing the variable *this_system* with each item in
this input set
This would allow to combine a number of filter expressions into one
big sophisticated filter.
I have left the above proposal at an appropriate issue on GitHub:
*#2033 complex conditions ...how?*
issuecomment-158101715
<https://github.com/Jermolene/TiddlyWiki5/issues/2033#issuecomment-158101715>
Best wishes,
— tb
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