REST API: Pass correct ID to meta->update_value to permit setting term meta during term creation.

Props joehoyle.
Merges [43636] to the 4.9 branch.
Fixes #44834.

git-svn-id: https://develop.svn.wordpress.org/branches/4.9@43637 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

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

@@ -441,7 +441,7 @@ public function create_item( $request ) {
 
 		$schema = $this->get_item_schema();
 		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
-			$meta_update = $this->meta->update_value( $request['meta'], (int) $request['id'] );
+			$meta_update = $this->meta->update_value( $request['meta'], $term->term_id );
 
 			if ( is_wp_error( $meta_update ) ) {
 				return $meta_update;

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

@@ -616,6 +616,37 @@ public function test_create_item_parent_non_hierarchical_taxonomy() {
 		$this->assertErrorResponse( 'rest_taxonomy_not_hierarchical', $response, 400 );
 	}
 
+	public function test_create_item_with_meta() {
+		wp_set_current_user( self::$administrator );
+		$request = new WP_REST_Request( 'POST', '/wp/v2/tags' );
+		$request->set_param( 'name', 'My Awesome Term' );
+		$request->set_param( 'meta', array( 'test_tag_single' => 'hello' ) );
+		$response = rest_get_server()->dispatch( $request );
+		$this->assertEquals( 201, $response->get_status() );
+		$headers = $response->get_headers();
+		$data    = $response->get_data();
+		$this->assertContains( '/wp/v2/tags/' . $data['id'], $headers['Location'] );
+		$this->assertEquals( 'My Awesome Term', $data['name'] );
+		$this->assertEquals( 'hello', get_term_meta( $data['id'], 'test_tag_single', true ) );
+	}
+
+	public function test_create_item_with_meta_wrong_id() {
+		wp_set_current_user( self::$administrator );
+		$existing_tag_id = $this->factory->tag->create( array( 'name' => 'My Not So Awesome Term' ) );
+		$request         = new WP_REST_Request( 'POST', '/wp/v2/tags' );
+		$request->set_param( 'name', 'My Awesome Term' );
+		$request->set_param( 'meta', array( 'test_tag_single' => 'hello' ) );
+		$request->set_param( 'id', $existing_tag_id );
+		$response = rest_get_server()->dispatch( $request );
+		$this->assertEquals( 201, $response->get_status() );
+		$headers = $response->get_headers();
+		$data    = $response->get_data();
+		$this->assertContains( '/wp/v2/tags/' . $data['id'], $headers['Location'] );
+		$this->assertEquals( 'My Awesome Term', $data['name'] );
+		$this->assertEquals( '', get_term_meta( $existing_tag_id, 'test_tag_single', true ) );
+		$this->assertEquals( 'hello', get_term_meta( $data['id'], 'test_tag_single', true ) );
+	}
+
 	public function test_update_item() {
 		wp_set_current_user( self::$administrator );
 		$orig_args = array(