[wp-trac] [WordPress Trac] #45265: REST API: register_rest_route should warn when used improperly.

[WordPress Trac]

#45265: REST API: register_rest_route should warn when used improperly.
--------------------------+-----------------------------
 Reporter:  kraftbj       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:
 Severity:  normal        |   Keywords:  has-patch
  Focuses:  rest-api      |
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 According to the [https://developer.wordpress.org/rest-api/extending-the-
 rest-api/routes-and-endpoints/#creating-endpoints documentation], REST API
 endpoints should be hooked onto the `rest_api_init` action.

 When this function is fired without a hook or on the wrong hook, it can
 result in unexpected behavior. For example, calling it directly from a mu-
 plugin to add an endpoint on a namespace that is also defined on the
 `rest_api_init` hook will result in the mu-plugin directly-called version
 completely overriding the namespace, instead of the expected merging to
 the namespace.

 To help ensure intended use, we should `_doing_it_wrong` when
 register_rest_route is used outside of the expected hook.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45265>
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