How to output resources from multiple select to template via getResource?

Question

MODX

I have a multiple choice TV from products resources, in possible values ​​- @SELECT pagetitle, id FROM modx_site_content WHERE parent=29 , I want to display the products selected by this field in the template:

But nothing is displayed if I have selected two or more products. Because id is passed to &resources without any separators - 2829 - this is how id - 28 and id - 29 are passed.
When I select one product, everything works fine by itself, since 1 id is passed to &resources.
How do I pass id to &resources separated by commas at what point and how to separate them?

Answer 1

Set the output separator.