PCH: ability to filter Related Posts by multiple Sections

[danielabloch]

Is your feature request related to a problem?

Customers often use multiple sections, or more specifically a section and a sub-section, to organize their content online. The Related Posts filter for Section limits users to selecting one Section when they would like to select multiple.

Describe the solution you'd like

When using the Related Posts filter for Section, allow users to select multiple sections at once to inform the filter. I believe an OR logic would be helpful here versus AND; that is, as a user, I can filter my results by Health OR News Health versus limiting it to Health AND News Health.

Describe alternatives you've considered

An alternative would be offering another filter by option that is Sub Section, but I believe that would be more cumbersome in terms of usability and would not allow a customer to choose multiple sections.

[acicovic]

Per the docs, it seems that we can already specify multiple section params:

I assume this will work for subsections, for example passing ?section=section&section=subsection? Docs say that this is possible for tag and author, but they don't mention section specifically.

Noting that in the plugin we use WordPress categories to fill the drop-down, and that we are unaware of what's defined as a subsection in Parse.ly.

[acicovic]

I'll try to post here with a wrap-up of our understanding regarding these API calls. For now, I'm de-prioritizing this as 3.18 will have to focus on other features.