Ability to filter multiple uses of a template on a page.

[tjoneslo]

I have a DPL query of the form:

{{#dpl: 
 category= My used category
 |include=  {My template}.dpl
 |ordermethod = title
 |order= ascending
 |table   = class=wikitable sortable,Article, Name, Description
}}

What happens is articles may use My template more than once on a page with different parameters.

{{My template|name=foo | description = Fred}}
{{My template|name=bar | description = Mary}}

This produces a table with both uses of My template in the article.

What I'd like is to have a filter to only return the templates with name=foo (and the other parameters).

[Universal-Omega]

I looked into this for a couple of hours, a couple weeks ago, and am unable to find any feasible solution to it. Nonetheless, I might still try to keep working on something. I'm just not sure I'll actually be able to achieve this. If I'm unable to, I'll likely close this, but I'll try to do it.

[CrystalClearGal]

Does use of the distinct parameter not work in this case?

https://dpl3.wikitide.org/wiki/Criteria_for_page_selection#distinct

Edit: Ah, nevermind, I forgot distinct only works in combo with linksto/linksfrom. Apologies.
Edit2: Actually no, it works with most params... it being a table seems to be the no-go.

The distinct param works for me (3.6.1) in list format, but as soon as I add the include parameter for table formatting, that's when distinct control is kicked out. Perhaps distinct is applied before table include somehow?

[CrystalClearGal]

The distinct parameter (worked in 3.6.1) now doesn't work on the current version of DPL4 (used on the doc site).

https://dpl3.wikitide.org/wiki/Help:44

[Universal-Omega]

The distinct parameter (worked in 3.6.1) now doesn't work on the current version of DPL4 (used on the doc site).

https://dpl3.wikitide.org/wiki/Help:44

As you noted issue with titlematch on that page, that has now been fixed. However distinct I have no idea why it isn't as I even removed all calls that runs distinct for the query and it still has the same result. So something besides the query must be making it distinct.

[CrystalClearGal]

{{My template|name=foo | description = Fred}}
{{My template|name=bar | description = Mary}}

What I'd like is to have a filter to only return the templates with name=foo (and the other parameters).

Actually in thinking about this more, this is what the existing includematch parameter does.

{{#dpl:
|category     = Fruit examples
|namespace    = 
|include      = {Fruit-Infobox}:grows
|includematch = /grows\s*=\s*[^¦]*[Vv]ines/s
|table        = class="wikitable", Page, Growth Area
}}

See a live working example here: https://dpl3.wikitide.org/wiki/Help:44

[CrystalClearGal]

Here's another old example, where we list only page template details for pages that use a certain update= number, despite multiple template uses.
https://www.dragon-mania-legends.wiki/wiki/Template:UpdateDetails-DPL3

For the first result, if you view the page's History section, you'll see where the template is used multiple times with various update numbers, but we successfully selected just one number (e.g., for use on a corresponding update page).