I have to assume that it's just a limitation in how the JSON structure is
translated to and from text references. JSON doesn't actually have an
"official" addressing scheme for sub-objects, only add-on standards like
JSON pointer. TiddlyWiki allows most characters (including dots) in field
names.
Relevant functions in the TiddlyWiki core code: getTextReference -->
extractTiddlerDataItem --> getTiddlerDataCached --> getTiddlerData
Looks like internally, the whole JSON structure is parsed, but
extractTiddlerDataItem has no rule to look for a delimiter (like ".") and
access sub-objects. This bit of code in that function would need to be
expanded into something more complicated:
if(data && $tw.utils.hop(data,index)) {
text = data[index];
}
...So at a glance this looks like it would be a pretty easy "mod" to
implement, if you're willing to mess with some core code.
On Wednesday, 27 December 2017 13:15:32 UTC-6, Joshua Fontany wrote:
>
> Hi all you tiddlywiki dev folks,
>
> I am making progress with my RenderTable widget, but have run into a
> situation where I need to add or remove items from arrays listed in JSON
> tiddlers. This is so I can add/remove "table rows" when the table is being
> fed by "application/json" tiddlers. I have a solution sketched out for
> using javascript's array.splice() method, but had a question before I start.
>
> *Why can we currently access only the "root level" elements of a JSON
> tiddler?*
>
> Is this a performance or other technical limitation or has a solution for
> this just not been created yet?
>
> Currently, I "flatten" my JSON tiddlers with another plugin I made in
> order to simulate storing data as nested objects & arrays. I can then
> access the data I want with a "path" key/index. If this "flattening" is
> unnecessary, I'd love to be able to work on allowing regular "nested" JSONs
> to be used within tiddlywiki. Otherwise, I'll have to work around the
> limitation.
>
> Thank you all for any insight you can provide while I go and read through
> the core tiddlers that reference JSON stuff. :D
>
> Best,
> Joshua Fontany
>
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