[wp-trac] [WordPress Trac] #42989: REST API: Using array type when defining fields in register_rest_route() causes undefined index notices

[WordPress Trac]

#42989: REST API: Using array type when defining fields in register_rest_route()
causes undefined index notices
--------------------------+------------------------------
 Reporter:  sarukuku      |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  REST API      |     Version:  4.9.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:  rest-api
--------------------------+------------------------------

Comment (by rachelbaker):

 @sarukuku what happens if you set the `items` key for the `test` arg?  It
 looks like you haven't set what type of values expect from the array.

 {{{#!php
 <?php
     register_rest_route( 'test/v1', 'array_test', array(
         array(
             'methods' => WP_REST_Server::READABLE,
             'callback' => function ( WP_REST_Request $request ) {
                 // Just reflect back the value of the test parameter
                return rest_ensure_response( $request->get_param( 'test' )
 );
              },
             'args' => array(
                 'test' => array(
                     'type' => 'array',
                     'items' => 'string'
                 )
             )
         )
  ));
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/42989#comment:2>
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