[wp-trac] [WordPress Trac] #27015: WP_Query::get_queried_object() does not always work in 'pre_get_posts'

[WordPress Trac]

#27015: WP_Query::get_queried_object() does not always work in 'pre_get_posts'
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 Reporter:  bcworkz       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Query         |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Related: [[#26627]]
 The referenced ticket fixes the situation for categories. Inline docs
 indicate the method returns objects for the following query types:
 '''category, tag, taxonomy, posts page, single post, page, author'''.

 Some of these work, some do not. This became apparent from the forums:
 http://wordpress.org/support/topic/get_queried_object-no-longer-working-
 with-pre_get_posts-and-pretty-permalinks/
 Props jeich

 Test setup.
 Trunk at !#27067 used. (and 3.7 for regression check)
 Default setup of fresh install except for the following as plugin:
 * Hook 'pre_get_get_posts' and dump get_queried_object return if it
 is_main_query
 * Add custom taxonomy and associate with posts
 * Register CPT
 Change permalink setting to complete CPT rewrite registration

 Also modify the DB as follows to test various query types:
 * Add  a tag to the Hello World post.
 * Add a custom taxonomy term to the Hello World post.
 * Add a CPT post
 The site was browsed through various pages using the default (none)
 permalink, then the month and name permalink. The result of getting a
 queried object was recorded:
 ||                       ||=no permalink  =||=month and name=||
 ||uncategorized category ||stdClass object ||stdClass object||
 ||tag archive            ||NULL            ||NULL||
 ||taxonomy term archive  ||stdClass object ||stdClass object||
 ||CPT archive            ||stdClass object ||stdClass object||
 ||single post            ||NULL            ||NULL||
 ||single CPT             ||NULL            ||NULL||
 ||page                   ||NULL            ||WP_Post object||
 ||author archive         ||WP_User object  ||False||
 ||posts page             ||WP_Post object  ||WP_Post object||

 NULLs indicate failure of `get_queried_object()`. Except for tag archive,
 all NULLs returned are due to regression prior to 3.7. Why the tag archive
 failed in 3.8 is unclear, but the proposed patch addresses this issue as
 well as all other NULL returns.

 For those that don't know, the reason for different results with pretty
 permalinks enabled is different query vars are defined when rewrite rules
 are applied. The default no pretty permalinks does not use rewrite rules
 and the query vars can only be what is parsed from the request.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27015>
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