Re: [Cargo] inverse relationships and property domains?

Hi David,

You shouldn't be storing inverse relationships (like "ComposedOf") at all -
rather, that information should get directly queried whenever you want to
display it. And the variable to use, when you want to display a page's
name, is {{PAGENAME}} - so, in the template, you could add a query like:

{{#cargo_query:table=Place|fields=_pageName|where=PartOf = '{{PAGENAME}}'}}

-Yaron

On Fri, Sep 3, 2021 at 8:03 PM David Epstein <[email protected]> wrote:

> 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 <[email protected]> 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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