Fix Gutenberg saving authors after PHP save post hooks have already run

php/api/endpoints/class-coauthors-controller.php

@@ -275,6 +275,12 @@ public function get_item_schema(): array {
 					'context'     => array( 'view' ),
 					'readonly'    => true,
 				),
+				'term_id' => array(
+					'description' => __( 'Term ID for the Authors Taxonomy', 'co-authors-plus' ),
+					'type'        => 'integer',
+					'context'     => array( 'view' ),
+					'readonly'    => true,
+				),
 			),
 		);
 

php/class-coauthors-endpoint.php

@@ -209,6 +209,8 @@ public function can_edit_coauthors(): bool {
 	 */
 	public function _format_author_data( $author ): array {
 
+		$term = $this -> coauthors -> get_author_term( $author );
+
 		return array(
 			'id'           => esc_html( $author->ID ),
 			'userNicename' => esc_html( rawurldecode( $author->user_nicename ) ),
@@ -217,6 +219,7 @@ public function _format_author_data( $author ): array {
 			'displayName'  => esc_html( str_replace( '∣', '|', $author->display_name ) ),
 			'avatar'       => esc_url( get_avatar_url( $author->ID ) ),
 			'userType'     => esc_html( $author->type ),
+			'termID'	   => absint( $term -> term_id ),
 		);
 	}
 

src/components/author-selection/index.jsx

@@ -123,6 +123,7 @@ AuthorsSelection.propTypes = {
 			email: PropTypes.string,
 			displayName: PropTypes.string,
 			avatar: PropTypes.string,
+			termID: PropTypes.number,
 		} ),
 	] ).isRequired,
 	updateAuthors: PropTypes.func.isRequired,

src/components/co-authors/index.jsx

@@ -102,8 +102,21 @@ const CoAuthors = () => {
 	const updateAuthors = ( newAuthors ) => {
 		setAuthorsStore( newAuthors );
 		setSelectedAuthors( newAuthors );
+		setPostTerms( newAuthors );
 	};
 
+	const setPostTerms = ( newAuthors ) => {
+
+		var authorTerms = [];
+
+		newAuthors.forEach(( author ) => {
+
+			authorTerms.push( author.termID );
+		});
+
+		wp.data.dispatch('core/editor').editPost({ coauthors: authorTerms } );
+	}
+
 	/**
 	 * Change handler for adding new item by value.
 	 * Updates authors state.

src/index.js

@@ -29,21 +29,3 @@ registerPlugin( 'plugin-coauthors-document-setting', {
 	icon: 'users',
 } );
 
-// Save authors when the post is saved.
-// https://github.com/WordPress/gutenberg/issues/17632
-const { isSavingPost, getCurrentPost } = select("core/editor");
-const { getAuthors, saveAuthors } = select("cap/authors");
-
-let checked = true; // Start in a checked state.
-
-subscribe(() => {
-	if (isSavingPost()) {
-		checked = false;
-	} else if (!checked) {
-		const { id } = getCurrentPost();
-		const authors = getAuthors(id);
-		saveAuthors(id, authors);
-		checked = true;
-	}
-});
-

src/utils.js

@@ -71,15 +71,17 @@ export const addItemByValue = (
  * @param {string} root0.userNicename The unique username.
  * @param {string} root0.email        The author's email address.
  * @param {string} root0.userType     The entity type, either 'wpuser' or 'guest-user'.
+ * @param {string} root0.termID       The ID for the user's term in the "author" taxonomy
  *
  * @return {Object} The object containing data relevant to the Coauthors component.
  */
-export const formatAuthorData = ( { id, displayName, userNicename, email, userType } ) => {
+export const formatAuthorData = ( { id, displayName, userNicename, email, userType, termID } ) => {
 	return {
 		id,
 		label: `${ displayName } | ${ email }`,
 		display: displayName,
 		value: userNicename,
 		userType,
+		termID,
 	};
 };