[wp-trac] [WordPress Trac] #38629: REST API: Allowed public or private WP_Query vars are lost in `prepare_items_query()`

[WordPress Trac]

#38629: REST API: Allowed public or private WP_Query vars are lost in
`prepare_items_query()`
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 Reporter:  rachelbaker   |       Owner:  rmccue
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.7
Component:  REST API      |     Version:  trunk
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by rmccue):

 Added a patch that removes `get_allowed_query_vars()`. Per discussion,
 this is really only needed when we were accepting anything. A plugin that
 re-implements `filter` (removed in #38378) would need to add these filters
 back for `filter` sub-parameters.

 This patch adds a new filter: `rest_{type}_collection_params`, allowing
 implementation per [comment:13 Joe's comment above]. I've also retained
 the `rest_query_var-{var}` filter, although I'm not sure whether we need
 that, as `rest_{type}_query` can be used on the array instead.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38629#comment:16>
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