Sam and Yaron,
I'm trying to implement the inverse of PartOf (ComposedOf) as discussed on
this list a few days ago (also at end of this email). I'm using Cargo,
PageSchemas, and PageForms. My understanding is that ComposedOf would not
be part of the schema, but would be a manual edit to the automatically
generated template for the *Place* category. Below is the template code
with the manual edits in color. The first "_pageName" refers to data in
Cargo tables. The second "_pageName" is the current page being displayed,
which I don't know how to specify in this context. This code results in no
error and no text after the "ComposedOf" label. When viewing the place "Sol
System", the ComposedOf text should include links to Earth and Mars, since
they are both currently in the Place table as PartOf the Sol System. In
this context, the second _pageName should return "Sol System" (or
"Sol_System" ?).
<noinclude>
{{#template_params:Type|PartOf (label=Part Of)|ComposedOf}}
{{#cargo_declare:_table=Place|Type=Page (allowed
values=SolarSystem,AsteroidBelt,Asteroid,Planet,WaterBody,Continent,GeographicEntity,Nation,SubNationalRegion,City,Neighborhood,Street,Building,Room)|PartOf=Page
|ComposedOf={{#cargo_query:table=Place|fields=Place._pageName|where =
PartOf HOLDS "_pageName"}}}}
</noinclude><includeonly>{{#cargo_store:_table=Place}}
{{#template_display:_format=standard}}
[[Category:Place]]
</includeonly>
I pushed on "Recreate Data" in the Template menu, which may explain how
"ComposedOf" got added to the table. I did not add ComposedOf to the schema.
Here is the Place table:
Page Type PartOf ComposedOf
Earth Planet Sol System
Mars Planet Sol System
Sol System SolarSystem
-david
On Mon, Aug 30, 2021 at 9:11 PM Sam Wilson <s...@samwilson.id.au> wrote:
> I think the normal way to do this in Cargo would be not to have the
> inverse property stored in a page's data, but rather to query the inverse
> wherever required. So, for example, an Idaho page would define part_of as
> USA, and then on the USA page you could have a template that displays all
> the composed_of pages: {{#cargo query: tables = places | where = part_of
> HOLDS 'USA' }}. This way, there's no double-entry of values and so
> nothing to get out of sync.
> On 31/8/21 6:42 am, David Epstein wrote:
>
> If a class has a *composed_of *property and a *part_of* property, can I
> define these somewhere as inverse relationships? I'd like to set Idaho as
> *part_of* the USA and then (automatically) see that assignment in USA's
> *composed_of
> *list?
>
> Moreover, is it possible to specify that the properties have a more
> specific domain, not just any page but only pages from the category "Place"?
>
>
>
>
>
>
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