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class-wp-rest-revisions-controller.php (24555B)

---

 <?php
 /**
  * REST API: WP_REST_Revisions_Controller class
  *
  * @package WordPress
  * @subpackage REST_API
  * @since 4.7.0
  */
 
 /**
  * Core class used to access revisions via the REST API.
  *
  * @since 4.7.0
  *
  * @see WP_REST_Controller
  */
 class WP_REST_Revisions_Controller extends WP_REST_Controller {
 
 	/**
 	 * Parent post type.
 	 *
 	 * @since 4.7.0
 	 * @var string
 	 */
 	private $parent_post_type;
 
 	/**
 	 * Parent controller.
 	 *
 	 * @since 4.7.0
 	 * @var WP_REST_Controller
 	 */
 	private $parent_controller;
 
 	/**
 	 * The base of the parent controller's route.
 	 *
 	 * @since 4.7.0
 	 * @var string
 	 */
 	private $parent_base;
 
 	/**
 	 * Constructor.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param string $parent_post_type Post type of the parent.
 	 */
 	public function __construct( $parent_post_type ) {
 		$this->parent_post_type  = $parent_post_type;
 		$this->namespace         = 'wp/v2';
 		$this->rest_base         = 'revisions';
 		$post_type_object        = get_post_type_object( $parent_post_type );
 		$this->parent_base       = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
 		$this->parent_controller = $post_type_object->get_rest_controller();
 
 		if ( ! $this->parent_controller ) {
 			$this->parent_controller = new WP_REST_Posts_Controller( $parent_post_type );
 		}
 	}
 
 	/**
 	 * Registers the routes for revisions based on post types supporting revisions.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @see register_rest_route()
 	 */
 	public function register_routes() {
 
 		register_rest_route(
 			$this->namespace,
 			'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base,
 			array(
 				'args'   => array(
 					'parent' => array(
 						'description' => __( 'The ID for the parent of the revision.' ),
 						'type'        => 'integer',
 					),
 				),
 				array(
 					'methods'             => WP_REST_Server::READABLE,
 					'callback'            => array( $this, 'get_items' ),
 					'permission_callback' => array( $this, 'get_items_permissions_check' ),
 					'args'                => $this->get_collection_params(),
 				),
 				'schema' => array( $this, 'get_public_item_schema' ),
 			)
 		);
 
 		register_rest_route(
 			$this->namespace,
 			'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)',
 			array(
 				'args'   => array(
 					'parent' => array(
 						'description' => __( 'The ID for the parent of the revision.' ),
 						'type'        => 'integer',
 					),
 					'id'     => array(
 						'description' => __( 'Unique identifier for the revision.' ),
 						'type'        => 'integer',
 					),
 				),
 				array(
 					'methods'             => WP_REST_Server::READABLE,
 					'callback'            => array( $this, 'get_item' ),
 					'permission_callback' => array( $this, 'get_item_permissions_check' ),
 					'args'                => array(
 						'context' => $this->get_context_param( array( 'default' => 'view' ) ),
 					),
 				),
 				array(
 					'methods'             => WP_REST_Server::DELETABLE,
 					'callback'            => array( $this, 'delete_item' ),
 					'permission_callback' => array( $this, 'delete_item_permissions_check' ),
 					'args'                => array(
 						'force' => array(
 							'type'        => 'boolean',
 							'default'     => false,
 							'description' => __( 'Required to be true, as revisions do not support trashing.' ),
 						),
 					),
 				),
 				'schema' => array( $this, 'get_public_item_schema' ),
 			)
 		);
 
 	}
 
 	/**
 	 * Get the parent post, if the ID is valid.
 	 *
 	 * @since 4.7.2
 	 *
 	 * @param int $parent Supplied ID.
 	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
 	 */
 	protected function get_parent( $parent ) {
 		$error = new WP_Error(
 			'rest_post_invalid_parent',
 			__( 'Invalid post parent ID.' ),
 			array( 'status' => 404 )
 		);
 		if ( (int) $parent <= 0 ) {
 			return $error;
 		}
 
 		$parent = get_post( (int) $parent );
 		if ( empty( $parent ) || empty( $parent->ID ) || $this->parent_post_type !== $parent->post_type ) {
 			return $error;
 		}
 
 		return $parent;
 	}
 
 	/**
 	 * Checks if a given request has access to get revisions.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
 	 */
 	public function get_items_permissions_check( $request ) {
 		$parent = $this->get_parent( $request['parent'] );
 		if ( is_wp_error( $parent ) ) {
 			return $parent;
 		}
 
 		if ( ! current_user_can( 'edit_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_read',
 				__( 'Sorry, you are not allowed to view revisions of this post.' ),
 				array( 'status' => rest_authorization_required_code() )
 			);
 		}
 
 		return true;
 	}
 
 	/**
 	 * Get the revision, if the ID is valid.
 	 *
 	 * @since 4.7.2
 	 *
 	 * @param int $id Supplied ID.
 	 * @return WP_Post|WP_Error Revision post object if ID is valid, WP_Error otherwise.
 	 */
 	protected function get_revision( $id ) {
 		$error = new WP_Error(
 			'rest_post_invalid_id',
 			__( 'Invalid revision ID.' ),
 			array( 'status' => 404 )
 		);
 
 		if ( (int) $id <= 0 ) {
 			return $error;
 		}
 
 		$revision = get_post( (int) $id );
 		if ( empty( $revision ) || empty( $revision->ID ) || 'revision' !== $revision->post_type ) {
 			return $error;
 		}
 
 		return $revision;
 	}
 
 	/**
 	 * Gets a collection of revisions.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_items( $request ) {
 		$parent = $this->get_parent( $request['parent'] );
 		if ( is_wp_error( $parent ) ) {
 			return $parent;
 		}
 
 		// Ensure a search string is set in case the orderby is set to 'relevance'.
 		if ( ! empty( $request['orderby'] ) && 'relevance' === $request['orderby'] && empty( $request['search'] ) ) {
 			return new WP_Error(
 				'rest_no_search_term_defined',
 				__( 'You need to define a search term to order by relevance.' ),
 				array( 'status' => 400 )
 			);
 		}
 
 		// Ensure an include parameter is set in case the orderby is set to 'include'.
 		if ( ! empty( $request['orderby'] ) && 'include' === $request['orderby'] && empty( $request['include'] ) ) {
 			return new WP_Error(
 				'rest_orderby_include_missing_include',
 				__( 'You need to define an include parameter to order by include.' ),
 				array( 'status' => 400 )
 			);
 		}
 
 		if ( wp_revisions_enabled( $parent ) ) {
 			$registered = $this->get_collection_params();
 			$args       = array(
 				'post_parent'      => $parent->ID,
 				'post_type'        => 'revision',
 				'post_status'      => 'inherit',
 				'posts_per_page'   => -1,
 				'orderby'          => 'date ID',
 				'order'            => 'DESC',
 				'suppress_filters' => true,
 			);
 
 			$parameter_mappings = array(
 				'exclude'  => 'post__not_in',
 				'include'  => 'post__in',
 				'offset'   => 'offset',
 				'order'    => 'order',
 				'orderby'  => 'orderby',
 				'page'     => 'paged',
 				'per_page' => 'posts_per_page',
 				'search'   => 's',
 			);
 
 			foreach ( $parameter_mappings as $api_param => $wp_param ) {
 				if ( isset( $registered[ $api_param ], $request[ $api_param ] ) ) {
 					$args[ $wp_param ] = $request[ $api_param ];
 				}
 			}
 
 			// For backward-compatibility, 'date' needs to resolve to 'date ID'.
 			if ( isset( $args['orderby'] ) && 'date' === $args['orderby'] ) {
 				$args['orderby'] = 'date ID';
 			}
 
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
 			$args       = apply_filters( 'rest_revision_query', $args, $request );
 			$query_args = $this->prepare_items_query( $args, $request );
 
 			$revisions_query = new WP_Query();
 			$revisions       = $revisions_query->query( $query_args );
 			$offset          = isset( $query_args['offset'] ) ? (int) $query_args['offset'] : 0;
 			$page            = (int) $query_args['paged'];
 			$total_revisions = $revisions_query->found_posts;
 
 			if ( $total_revisions < 1 ) {
 				// Out-of-bounds, run the query again without LIMIT for total count.
 				unset( $query_args['paged'], $query_args['offset'] );
 
 				$count_query = new WP_Query();
 				$count_query->query( $query_args );
 
 				$total_revisions = $count_query->found_posts;
 			}
 
 			if ( $revisions_query->query_vars['posts_per_page'] > 0 ) {
 				$max_pages = ceil( $total_revisions / (int) $revisions_query->query_vars['posts_per_page'] );
 			} else {
 				$max_pages = $total_revisions > 0 ? 1 : 0;
 			}
 
 			if ( $total_revisions > 0 ) {
 				if ( $offset >= $total_revisions ) {
 					return new WP_Error(
 						'rest_revision_invalid_offset_number',
 						__( 'The offset number requested is larger than or equal to the number of available revisions.' ),
 						array( 'status' => 400 )
 					);
 				} elseif ( ! $offset && $page > $max_pages ) {
 					return new WP_Error(
 						'rest_revision_invalid_page_number',
 						__( 'The page number requested is larger than the number of pages available.' ),
 						array( 'status' => 400 )
 					);
 				}
 			}
 		} else {
 			$revisions       = array();
 			$total_revisions = 0;
 			$max_pages       = 0;
 			$page            = (int) $request['page'];
 		}
 
 		$response = array();
 
 		foreach ( $revisions as $revision ) {
 			$data       = $this->prepare_item_for_response( $revision, $request );
 			$response[] = $this->prepare_response_for_collection( $data );
 		}
 
 		$response = rest_ensure_response( $response );
 
 		$response->header( 'X-WP-Total', (int) $total_revisions );
 		$response->header( 'X-WP-TotalPages', (int) $max_pages );
 
 		$request_params = $request->get_query_params();
 		$base           = add_query_arg( urlencode_deep( $request_params ), rest_url( sprintf( '%s/%s/%d/%s', $this->namespace, $this->parent_base, $request['parent'], $this->rest_base ) ) );
 
 		if ( $page > 1 ) {
 			$prev_page = $page - 1;
 
 			if ( $prev_page > $max_pages ) {
 				$prev_page = $max_pages;
 			}
 
 			$prev_link = add_query_arg( 'page', $prev_page, $base );
 			$response->link_header( 'prev', $prev_link );
 		}
 		if ( $max_pages > $page ) {
 			$next_page = $page + 1;
 			$next_link = add_query_arg( 'page', $next_page, $base );
 
 			$response->link_header( 'next', $next_link );
 		}
 
 		return $response;
 	}
 
 	/**
 	 * Checks if a given request has access to get a specific revision.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
 	 */
 	public function get_item_permissions_check( $request ) {
 		return $this->get_items_permissions_check( $request );
 	}
 
 	/**
 	 * Retrieves one revision from the collection.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_item( $request ) {
 		$parent = $this->get_parent( $request['parent'] );
 		if ( is_wp_error( $parent ) ) {
 			return $parent;
 		}
 
 		$revision = $this->get_revision( $request['id'] );
 		if ( is_wp_error( $revision ) ) {
 			return $revision;
 		}
 
 		$response = $this->prepare_item_for_response( $revision, $request );
 		return rest_ensure_response( $response );
 	}
 
 	/**
 	 * Checks if a given request has access to delete a revision.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has access to delete the item, WP_Error object otherwise.
 	 */
 	public function delete_item_permissions_check( $request ) {
 		$parent = $this->get_parent( $request['parent'] );
 		if ( is_wp_error( $parent ) ) {
 			return $parent;
 		}
 
 		$parent_post_type = get_post_type_object( $parent->post_type );
 
 		if ( ! current_user_can( 'delete_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_delete',
 				__( 'Sorry, you are not allowed to delete revisions of this post.' ),
 				array( 'status' => rest_authorization_required_code() )
 			);
 		}
 
 		$revision = $this->get_revision( $request['id'] );
 		if ( is_wp_error( $revision ) ) {
 			return $revision;
 		}
 
 		$response = $this->get_items_permissions_check( $request );
 		if ( ! $response || is_wp_error( $response ) ) {
 			return $response;
 		}
 
 		if ( ! current_user_can( 'delete_post', $revision->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_delete',
 				__( 'Sorry, you are not allowed to delete this revision.' ),
 				array( 'status' => rest_authorization_required_code() )
 			);
 		}
 
 		return true;
 	}
 
 	/**
 	 * Deletes a single revision.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function delete_item( $request ) {
 		$revision = $this->get_revision( $request['id'] );
 		if ( is_wp_error( $revision ) ) {
 			return $revision;
 		}
 
 		$force = isset( $request['force'] ) ? (bool) $request['force'] : false;
 
 		// We don't support trashing for revisions.
 		if ( ! $force ) {
 			return new WP_Error(
 				'rest_trash_not_supported',
 				/* translators: %s: force=true */
 				sprintf( __( "Revisions do not support trashing. Set '%s' to delete." ), 'force=true' ),
 				array( 'status' => 501 )
 			);
 		}
 
 		$previous = $this->prepare_item_for_response( $revision, $request );
 
 		$result = wp_delete_post( $request['id'], true );
 
 		/**
 		 * Fires after a revision is deleted via the REST API.
 		 *
 		 * @since 4.7.0
 		 *
 		 * @param WP_Post|false|null $result The revision object (if it was deleted or moved to the Trash successfully)
 		 *                                   or false or null (failure). If the revision was moved to the Trash, $result represents
 		 *                                   its new state; if it was deleted, $result represents its state before deletion.
 		 * @param WP_REST_Request $request The request sent to the API.
 		 */
 		do_action( 'rest_delete_revision', $result, $request );
 
 		if ( ! $result ) {
 			return new WP_Error(
 				'rest_cannot_delete',
 				__( 'The post cannot be deleted.' ),
 				array( 'status' => 500 )
 			);
 		}
 
 		$response = new WP_REST_Response();
 		$response->set_data(
 			array(
 				'deleted'  => true,
 				'previous' => $previous->get_data(),
 			)
 		);
 		return $response;
 	}
 
 	/**
 	 * Determines the allowed query_vars for a get_items() response and prepares
 	 * them for WP_Query.
 	 *
 	 * @since 5.0.0
 	 *
 	 * @param array           $prepared_args Optional. Prepared WP_Query arguments. Default empty array.
 	 * @param WP_REST_Request $request       Optional. Full details about the request.
 	 * @return array Items query arguments.
 	 */
 	protected function prepare_items_query( $prepared_args = array(), $request = null ) {
 		$query_args = array();
 
 		foreach ( $prepared_args as $key => $value ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
 			$query_args[ $key ] = apply_filters( "rest_query_var-{$key}", $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 		}
 
 		// Map to proper WP_Query orderby param.
 		if ( isset( $query_args['orderby'] ) && isset( $request['orderby'] ) ) {
 			$orderby_mappings = array(
 				'id'            => 'ID',
 				'include'       => 'post__in',
 				'slug'          => 'post_name',
 				'include_slugs' => 'post_name__in',
 			);
 
 			if ( isset( $orderby_mappings[ $request['orderby'] ] ) ) {
 				$query_args['orderby'] = $orderby_mappings[ $request['orderby'] ];
 			}
 		}
 
 		return $query_args;
 	}
 
 	/**
 	 * Prepares the revision for the REST response.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param WP_Post         $post    Post revision object.
 	 * @param WP_REST_Request $request Request object.
 	 * @return WP_REST_Response Response object.
 	 */
 	public function prepare_item_for_response( $post, $request ) {
 		$GLOBALS['post'] = $post;
 
 		setup_postdata( $post );
 
 		$fields = $this->get_fields_for_response( $request );
 		$data   = array();
 
 		if ( in_array( 'author', $fields, true ) ) {
 			$data['author'] = (int) $post->post_author;
 		}
 
 		if ( in_array( 'date', $fields, true ) ) {
 			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
 		}
 
 		if ( in_array( 'date_gmt', $fields, true ) ) {
 			$data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );
 		}
 
 		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = $post->ID;
 		}
 
 		if ( in_array( 'modified', $fields, true ) ) {
 			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
 		}
 
 		if ( in_array( 'modified_gmt', $fields, true ) ) {
 			$data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );
 		}
 
 		if ( in_array( 'parent', $fields, true ) ) {
 			$data['parent'] = (int) $post->post_parent;
 		}
 
 		if ( in_array( 'slug', $fields, true ) ) {
 			$data['slug'] = $post->post_name;
 		}
 
 		if ( in_array( 'guid', $fields, true ) ) {
 			$data['guid'] = array(
 				/** This filter is documented in wp-includes/post-template.php */
 				'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
 				'raw'      => $post->guid,
 			);
 		}
 
 		if ( in_array( 'title', $fields, true ) ) {
 			$data['title'] = array(
 				'raw'      => $post->post_title,
 				'rendered' => get_the_title( $post->ID ),
 			);
 		}
 
 		if ( in_array( 'content', $fields, true ) ) {
 
 			$data['content'] = array(
 				'raw'      => $post->post_content,
 				/** This filter is documented in wp-includes/post-template.php */
 				'rendered' => apply_filters( 'the_content', $post->post_content ),
 			);
 		}
 
 		if ( in_array( 'excerpt', $fields, true ) ) {
 			$data['excerpt'] = array(
 				'raw'      => $post->post_excerpt,
 				'rendered' => $this->prepare_excerpt_response( $post->post_excerpt, $post ),
 			);
 		}
 
 		$context  = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data     = $this->add_additional_fields_to_object( $data, $request );
 		$data     = $this->filter_response_by_context( $data, $context );
 		$response = rest_ensure_response( $data );
 
 		if ( ! empty( $data['parent'] ) ) {
 			$response->add_link( 'parent', rest_url( sprintf( '%s/%s/%d', $this->namespace, $this->parent_base, $data['parent'] ) ) );
 		}
 
 		/**
 		 * Filters a revision returned from the REST API.
 		 *
 		 * Allows modification of the revision right before it is returned.
 		 *
 		 * @since 4.7.0
 		 *
 		 * @param WP_REST_Response $response The response object.
 		 * @param WP_Post          $post     The original revision object.
 		 * @param WP_REST_Request  $request  Request used to generate the response.
 		 */
 		return apply_filters( 'rest_prepare_revision', $response, $post, $request );
 	}
 
 	/**
 	 * Checks the post_date_gmt or modified_gmt and prepare any post or
 	 * modified date for single post output.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param string      $date_gmt GMT publication time.
 	 * @param string|null $date     Optional. Local publication time. Default null.
 	 * @return string|null ISO8601/RFC3339 formatted datetime, otherwise null.
 	 */
 	protected function prepare_date_response( $date_gmt, $date = null ) {
 		if ( '0000-00-00 00:00:00' === $date_gmt ) {
 			return null;
 		}
 
 		if ( isset( $date ) ) {
 			return mysql_to_rfc3339( $date );
 		}
 
 		return mysql_to_rfc3339( $date_gmt );
 	}
 
 	/**
 	 * Retrieves the revision's schema, conforming to JSON Schema.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @return array Item schema data.
 	 */
 	public function get_item_schema() {
 		if ( $this->schema ) {
 			return $this->add_additional_fields_schema( $this->schema );
 		}
 
 		$schema = array(
 			'$schema'    => 'http://json-schema.org/draft-04/schema#',
 			'title'      => "{$this->parent_post_type}-revision",
 			'type'       => 'object',
 			// Base properties for every Revision.
 			'properties' => array(
 				'author'       => array(
 					'description' => __( 'The ID for the author of the revision.' ),
 					'type'        => 'integer',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
 				'date'         => array(
 					'description' => __( "The date the revision was published, in the site's timezone." ),
 					'type'        => 'string',
 					'format'      => 'date-time',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
 				'date_gmt'     => array(
 					'description' => __( 'The date the revision was published, as GMT.' ),
 					'type'        => 'string',
 					'format'      => 'date-time',
 					'context'     => array( 'view', 'edit' ),
 				),
 				'guid'         => array(
 					'description' => __( 'GUID for the revision, as it exists in the database.' ),
 					'type'        => 'string',
 					'context'     => array( 'view', 'edit' ),
 				),
 				'id'           => array(
 					'description' => __( 'Unique identifier for the revision.' ),
 					'type'        => 'integer',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
 				'modified'     => array(
 					'description' => __( "The date the revision was last modified, in the site's timezone." ),
 					'type'        => 'string',
 					'format'      => 'date-time',
 					'context'     => array( 'view', 'edit' ),
 				),
 				'modified_gmt' => array(
 					'description' => __( 'The date the revision was last modified, as GMT.' ),
 					'type'        => 'string',
 					'format'      => 'date-time',
 					'context'     => array( 'view', 'edit' ),
 				),
 				'parent'       => array(
 					'description' => __( 'The ID for the parent of the revision.' ),
 					'type'        => 'integer',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
 				'slug'         => array(
 					'description' => __( 'An alphanumeric identifier for the revision unique to its type.' ),
 					'type'        => 'string',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
 			),
 		);
 
 		$parent_schema = $this->parent_controller->get_item_schema();
 
 		if ( ! empty( $parent_schema['properties']['title'] ) ) {
 			$schema['properties']['title'] = $parent_schema['properties']['title'];
 		}
 
 		if ( ! empty( $parent_schema['properties']['content'] ) ) {
 			$schema['properties']['content'] = $parent_schema['properties']['content'];
 		}
 
 		if ( ! empty( $parent_schema['properties']['excerpt'] ) ) {
 			$schema['properties']['excerpt'] = $parent_schema['properties']['excerpt'];
 		}
 
 		if ( ! empty( $parent_schema['properties']['guid'] ) ) {
 			$schema['properties']['guid'] = $parent_schema['properties']['guid'];
 		}
 
 		$this->schema = $schema;
 
 		return $this->add_additional_fields_schema( $this->schema );
 	}
 
 	/**
 	 * Retrieves the query params for collections.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @return array Collection parameters.
 	 */
 	public function get_collection_params() {
 		$query_params = parent::get_collection_params();
 
 		$query_params['context']['default'] = 'view';
 
 		unset( $query_params['per_page']['default'] );
 
 		$query_params['exclude'] = array(
 			'description' => __( 'Ensure result set excludes specific IDs.' ),
 			'type'        => 'array',
 			'items'       => array(
 				'type' => 'integer',
 			),
 			'default'     => array(),
 		);
 
 		$query_params['include'] = array(
 			'description' => __( 'Limit result set to specific IDs.' ),
 			'type'        => 'array',
 			'items'       => array(
 				'type' => 'integer',
 			),
 			'default'     => array(),
 		);
 
 		$query_params['offset'] = array(
 			'description' => __( 'Offset the result set by a specific number of items.' ),
 			'type'        => 'integer',
 		);
 
 		$query_params['order'] = array(
 			'description' => __( 'Order sort attribute ascending or descending.' ),
 			'type'        => 'string',
 			'default'     => 'desc',
 			'enum'        => array( 'asc', 'desc' ),
 		);
 
 		$query_params['orderby'] = array(
 			'description' => __( 'Sort collection by object attribute.' ),
 			'type'        => 'string',
 			'default'     => 'date',
 			'enum'        => array(
 				'date',
 				'id',
 				'include',
 				'relevance',
 				'slug',
 				'include_slugs',
 				'title',
 			),
 		);
 
 		return $query_params;
 	}
 
 	/**
 	 * Checks the post excerpt and prepare it for single post output.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param string  $excerpt The post excerpt.
 	 * @param WP_Post $post    Post revision object.
 	 * @return string Prepared excerpt or empty string.
 	 */
 	protected function prepare_excerpt_response( $excerpt, $post ) {
 
 		/** This filter is documented in wp-includes/post-template.php */
 		$excerpt = apply_filters( 'the_excerpt', $excerpt, $post );
 
 		if ( empty( $excerpt ) ) {
 			return '';
 		}
 
 		return $excerpt;
 	}
 }