G'day, You might be getting into some paralysis by analysis or analysis by paralysis (which is how I operate), or maybe you have some programming experience that is interfering with the "TiddlyWiki Way" (I'm a systems analyst and software developer, and I keep falling into the trap of seeing macros as functions), or I might be totally out in left field, which happens frequently.
Just to get a baseline for discussion, download the attached, drag it into
tiddlywiki.com to import the tiddlers, and give the imported tiddlers a
look.
Do the queries in the "Query systems" tiddler make sense?
On Wednesday, December 15, 2021 at 3:02:08 PM UTC-4 CarloGgi wrote:
> Hi everybody,
> the struggle to get TW do what I want it to do goes on hopelessly.
> I have a database of systems described by one data tiddler each, like this:
>
> system_1
> tag: system
> feature 11: Y/N
> feature 12: Y/N
> feature 13: Y/N
> feature 14: Y/N
>
> system_2
> tag: system
> feature 21: Y/N
> feature 22: Y/N
> feature 23: Y/N
> feature 24: Y/N
>
> as you can easily guess, the tiddlers record what features system X
> supports or not.
> Now I want to flexibly query my database for a certain feature, so I came
> up with this code:
>
> \define check_feature(feature) [getindex[$feature$]trim[]match[Y]]
>
> <$set name="has_feature" value=<$macrocall $name='check_feature'
> feature='IFTTT'/> >
> <ul>
> <$list filter="[tag[system]filter<has_feature>]" variable="sys">
> <li> <$link to=<<sys>>> <<sys>> </$link> </li>
> </$list>
> </ul>
>
> </$set>
>
> (in the example above I'm checking which systems are supported by IFTTT as
> you can imagine...). Fair enough, the above code DOESN'T work, because you
> cannot put a <$macrocall> widget as right-side element of the 'value'
> element of a <$set> widget. Ok, so how do I go? I know I could instead
> write:
>
> <$set name="has_feature" value=<<check_feature IFTTT>> >
>
> and that would work, but I need to use the <$macrocall> widget because the
> next step is to make the 'feature' parameter dynamically chosen via a
> <$select> instruction, so I would need to call the macro as below:
>
> <$macrocall $name='check_feature' feature={{!!current_chosen_feature}}/>
>
> where of course field 'current_chosen_feature' wouldbe set by the
> <$select> widget.
>
>
> Thanks in advance for helping. More and more TW seems to me like a too
> much beautiful, too much independent woman: you love her but you cannot
> make her listen to you...
>
>
>
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QueryingSystemsDB_TW.json
Description: application/json
