Hi Bob,
A few things to consider here.
Firstly, when you want to pass an indirect parameter (via text reference)
to a macro, you cannot use the form:
<<is_purchased_by {{!!artwork_id}} >>
Instead, you need to use the macrocall widget:
<$macrocall $name="is_purchased_by" artWorkID={{!!artwork_id}} />
Please see https://tiddlywiki.com/#MacroCallWidget for details.
Also, I think you will have an easier time of it if you have a field
"buyer" in all the artwork tiddlers which contains an ID for the buyer, and
the tiddlers describing buyers have their ID stored in a field "person_id".
Then in a Person tiddler to see all the artwork they have bought:
<$list filter="[buyer{!!person_id}]">
<$view field="artwork_title"/>
</$list>
And in an artwork tiddler to see the buyer's name:
<$text text={{{ [ person_id{!!buyer}get[person_name] }}} />
This should be easier than dealing with a field in artwork_id field in
buyers that is supposed to contain multiple values (which I assume is the
current structure).
Lastly, it might be worth considering to have different name prefixes for
tiddlers describing People and Art, e.g. Person P1 and Artwork TK1. The
idea being to be able to distinguish at a glance from the title if we are
looking at a tiddler describing a person or an artwork.
Hope this helps,
Saq
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