To test whether it worked, I used our Using a Shortcode display results method, following the guide here, and the customising section (so I had my own copy of the results.php file):
https://searchandfilter.com/documentation/search-results/using-a-shortcode/#customising-the-results
On each post for which there was a map needed, I made a map in wpgmaps and noted the ID.
Using Advanced Custom Fields, I created a ‘map_id’ custom field for these posts, and then added against each post the relevant map ID. I also made a parent map, and noted that map ID.
Before the while loop starts in the results.php template (‘the template’ from now on), I defined two variables:
$post_content_output = '';
$map_output = '[wpgmza id="2" mashup=true mashup_ids="';
where 2 is the parent map ID (so change to suit).
As each loop of while is run, you output the strings into $post_content_output and add the post map ID to $map_output, with a comma after each ID.
When the loop has finished, you need to trim the last comma off $map_output, then add '" parent_id="2"]' to it. That should complete it as a mashup shortcode.
Then you have two variables to echo to the page (one as a do_shortcode function).
I no longer have a copy of the results.php I used, sorry, so you would need to code this yourself, but the logic is as above.
This was the reference I used:
https://www.wpgmaps.com/documentation/advanced-map-options/map-shortcode-parameters/
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