[wp-trac] [WordPress Trac] #46641: Add blog_id to post object

[WordPress Trac]

#46641: Add blog_id to post object
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 Reporter:  Spidlace            |       Owner:  (none)
     Type:  enhancement         |      Status:  new
 Priority:  normal              |   Milestone:  Awaiting Review
Component:  Networks and Sites  |     Version:  5.1
 Severity:  normal              |  Resolution:
 Keywords:                      |     Focuses:  multisite
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Comment (by johnjamesjacoby):

 Hey @Spidlace, thanks for creating this ticket.

 My name is John and I’m one of several maintainers of the Multisite
 component inside of WordPress.

 I, for one, think this is a neat idea that could be expanded upon for any
 non-global object (everything but Users, basically.)

 This would be useful for prepopulating the blog ID for an object in a
 core-approved way that could be expanded or improved at a later date.

 As far as implementation details go, this might be a bit harder than it
 first appears. Posts, for example, have some magic associated with them,
 where they will look into Post-Meta for non-existent keys (like blog_id in
 your suggestion.)

 It is also highly unlikely that a literal `blog_id` column would be added
 to the database for any of the relevant object types, simply due to the
 low demand and high complexity of the necessary code changes to support
 this natively.

 That means we would be introducing something I’d conceptually refer to as
 a smart key (or just a key that has a private method associated with it to
 prime the value for the associated key.)

 This key, for example, would probably need to be assigned on
 `__construct()` as that’s where `switch_to_blog()` is guaranteed to be
 accurate.

 One other option is to actually store the value in meta. This is kinda
 redundant and a bit lazy, but is also super easy.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46641#comment:2>
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