[wp-trac] [WordPress Trac] #37837: Extend WP_Query author parameters to filter by role

[WordPress Trac]

#37837: Extend WP_Query author parameters to filter by role
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 Reporter:  jadpm            |      Owner:
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Query            |    Version:  trunk
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 WP_Query contains a series of author parameters (`author', ' author_name',
 ' author__in', and `author__not_in` as documented on the Codex).

 It wpould be nice to add `author_role__in` and maybe `author_role__not_in`
 as valid parameters, and be able to also query for posts given one or a
 set of user roles. I can see a lot of usages, and this has indeed been
 asked inside the community in some places, although I could not find a
 Track dedicated ticket.

 AFAIK, this would require the WP_Query database interaction to include the
 usermeta table, which can be expensive by default, and add a LIKE
 statement against the `wp_capabilities` usermeta field value, which is
 also expensive by default. So this might introduce performance problems
 and be discarded because of that. But otherwise, I would like that we
 consider this as a possible feature to add.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37837>
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