REST API: Rename post link relation in media endpoint to wp:attached-to

By adding the https://api.w.org/ prefix and using a more descriptive name for the link relation, this change creates greater clarity for this part of the API. Note that the renaming of this property is safe, as the API change has not yet made it into a final release.

Follow-up to [60893].

Props andrewserong, mukesh27, ramonopoly, timothyblynjacobs.
Fixes #64034.



git-svn-id: https://develop.svn.wordpress.org/trunk@60916 602fd350-edb4-49c9-b593-d223f7449a82

Author: andrewserong

src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -1022,7 +1022,7 @@ protected function prepare_links( $post ) {
 			$post = get_post( $post->post_parent );
 
 			if ( ! empty( $post ) ) {
-				$links['post'] = array(
+				$links['https://api.w.org/attached-to'] = array(
 					'href'       => rest_url( rest_get_route_for_post( $post ) ),
 					'embeddable' => true,
 					'post_type'  => $post->post_type,

tests/phpunit/tests/rest-api/rest-attachments-controller.php

@@ -1887,13 +1887,13 @@ public function test_links_contain_parent() {
 
 		$this->assertArrayHasKey( 'self', $links );
 		$this->assertArrayHasKey( 'author', $links );
-		$this->assertArrayHasKey( 'post', $links );
+		$this->assertArrayHasKey( 'https://api.w.org/attached-to', $links );
 
 		$this->assertCount( 1, $links['author'] );
-		$this->assertSame( rest_url( '/wp/v2/posts/' . $post ), $links['post'][0]['href'] );
-		$this->assertSame( 'post', $links['post'][0]['attributes']['post_type'] );
-		$this->assertSame( $post, $links['post'][0]['attributes']['id'] );
-		$this->assertTrue( $links['post'][0]['attributes']['embeddable'] );
+		$this->assertSame( rest_url( '/wp/v2/posts/' . $post ), $links['https://api.w.org/attached-to'][0]['href'] );
+		$this->assertSame( 'post', $links['https://api.w.org/attached-to'][0]['attributes']['post_type'] );
+		$this->assertSame( $post, $links['https://api.w.org/attached-to'][0]['attributes']['id'] );
+		$this->assertTrue( $links['https://api.w.org/attached-to'][0]['attributes']['embeddable'] );
 	}
 
 	public function test_publish_action_ldo_not_registered() {