An update.
I have noticed that if I add a <$log statement to the wikitext to try and
debug what is going on, I expect to see two entries in the dev console but
I see four (there are two marked artworks for the test run). Is this the
result of trying to write twice into the exhibition tiddler in the middle
of a $list run? Does this force two passes of the $list loop?
bobj
On Thursday, 1 October 2020 at 21:17:21 UTC+10 Bob Jansen wrote:
> I am trying to implement two simple functions but can not work out the
> wikitext. Tones, I have tried following your cheat sheet but nothing I try
> appears to work.
>
> One over arching question. When I use a $list statement to produce a
> subset of available tiddlers and then go through each in turn, does TW act
> like a loop, for each iteration I am focussed on a single defined tiddler
> from the subset? If so, how is this loop tiddler addressed, by
> <<currenttiddler>> or does this refer to the calling tiddler?
>
> This has bearing on the second of my functions, below.
>
> <code>
> <$macrocall
> $name="edit-list"
> tiddler="$:/TLS/exhibition_id"
> listview="{{{ [<value>get[exhibition_name]] }}}"
> filter="[tag[Exhibitions]!tag[Index]]"
> />
> <$list filter="[tag[Mark]]">
> <!--append exhibition_id to exhibition_id of each marked artwork
> tiddler-->
> <$action-setfield
> $field="exhibition_id"
> $value={{{ [{!!exhibition_id}addsuffix[
> ]addsuffix{$:/TLS/exhibition_id}] }}}
> />
> <!--append each artwork_id to artwork_id of the exhibition tiddler-->
> <$action-setfield
> $tiddler= {{{ [{$:/TLS/exhibition_id}] }}}
> $field="artwork_id"
> $value={{{ [{!!artwork_id}addsuffix[
> ]addsuffix{$:/TLS/artwork_id}] }}}
> />
> </$list>
> </code>
>
> The first action-setfield correctly adds the selected exhibition_id to the
> exhibition_id field of each artwork tiddler selected through the filter.
>
> For the second action-setfield, I am trying to append the artwork_id from
> the current artwork tiddler selected through the filter to the artwork_id
> field of the exhibition record determined by the exhibition_id selected
> above. This does not work, I only see the artwork_id of the last artwork
> record so either the append isn't working (but it is an identical statement
> that worked in the first action-setfield statement) or I am not seeing each
> artwork tiddler in turn, only the last one (hence my question above wrt to
> loop processing or I can not address the tiddler whose id is stored in
> $:/TLS/exhibition_id whilst iterating through a list of marked artwork
> tiddlers.
>
> Also, I need to amend the action-setfield statements so that if the
> artwork_id or exhibition_id already exist in the corresponding tiddler
> field, then the append does not take place. I assume that I need to use a
> conditional operator but can not work out the format of the statements.
> Eric has provided an example of this type of processing in the past but I
> can not find it.
>
> bobj
>
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