Query for all authors with an unbounded per_page=-1 request

[danielbachhuber]

Description

Queries for all potential authors with an unbounded GET /wp/v2/users?who=authors&per_page=-1 request.

Fixes #4622
See #6180 (comment)

How has this been tested?

Generate a bunch of authors programmatically with WP-CLI:

wp user generate --role=author --count=150

See them all appear in the post author dropdown:

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.

[noisysocks]

Tested this within Gutenberg and manually by hitting the API endpoint. Everything looks good, and I like this approach more than automatically iterating through pages on the frontend. 👍

Are we able to restrict the API so that only trusted clients (e.g. Gutenberg) can use unbounded queries? I suspect not since, from what I can tell, WP API lacks any notion of an API consumer/client.

wp user generate --role=author --count=150

Didn't know about this—very cool! 🤯

[pento]

Are we able to restrict the API so that only trusted clients (e.g. Gutenberg) can use unbounded queries? I suspect not since, from what I can tell, WP API lacks any notion of an API consumer/client.

Nope, but I'm fine with it being restricted to users with edit_posts, presumably the site owner trusts those users enough that the won't try to DoS the site like this.

[lkraav]

@danielbachhuber is select2 implementation possible here? Traditional select element is ux horror for large lists.

[danielbachhuber]

@lkraav Not at this time, no. See conversation in #6180 (comment)