This one has got me stumped.
I am offloading my wp_posts > post_content data to a custom field called post_content. See class at end of question to see how I am doing this.
And I am trying to filter the content loaded into my classic or block editor, so the content is actually loaded from my custom field called post_content, rather than loaded from the default wp_posts table.
I've tried these 3 filters and actions (not at the same time and no luck)...
add_action('edit_form_after_title', [ $this, 'load_custom_post_content_editor' ]);
public function load_custom_post_content_editor($post) {
// Check if the post type is 'post' or 'page'
if (in_array($post->post_type, array('post', 'page'))) {
$custom_post_content = get_post_meta($post->ID, 'post_content', true);
if (!empty($custom_post_content)) {
$post->post_content = $custom_post_content;
}
}
}
add_action('wp_insert_post_data', [ $this, 'modify_post_data' ], 10, 2);
public function modify_post_data($data, $postarr) {
// Check if the post type is allowed.
if (in_array($data['post_type'], self::$allowed_post_types)) {
$custom_post_content = get_post_meta($postarr['ID'], 'post_content', true);
if (!empty($custom_post_content)) {
$data['post_content'] = $custom_post_content;
}
}
return $data;
}
add_filter('block_editor_content', [ $this, 'filter_block_editor_content' ], 10, 2);
public function filter_block_editor_content($content, $post) {
// Check if the post type is allowed.
if ($post && in_array($post->post_type, self::$allowed_post_types)) {
$custom_post_content = get_post_meta($post->ID, 'post_content', true);
if (!empty($custom_post_content)) {
$content = $custom_post_content;
}
}
return $content;
}
None of these successfully load the content from my custom field in the WordPress editor, even though a 'post_content' custom field exists with the block editor content code inside the field.
Here the rest of my working class which offloads the post content to a custom field called post_content when saving post/pages in the admin...
<?php
/**
* Plugin Name: WP JSON Search
* Description: The WP JSON Search plugin allows you to search your WordPress website by merging complete post content, custom fields, and taxonomies into a single JSON string, which is then stored in your post_content in wp_posts table.
* Version: 1.0
* Author: Josh Cranwell
* Author URI: https://github.com/joshmoto
*/
class WP_JSON_Search {
/**
* @var array|string[] Allowed post types to save json search content.
*/
private static array $allowed_post_types = ['post', 'page'];
/**
* WP_JSON_Search constructor.
*/
public function __construct () {
// Save post_content to custom meta field when saving a draft or publishing a post/page.
add_action('save_post', [ $this, 'save_post_content' ], 10, 2);
// Filter the content to get data from the custom meta field.
add_filter('the_content', [ $this, 'filter_the_content' ]);
}
/**
* Save post_content to custom meta field when saving a draft or publishing a post/page.
* @param $post_id
* @param $post
* @return void
*/
public function save_post_content($post_id, $post): void
{
// Check if the post type is allowed.
if (in_array($post->post_type, self::$allowed_post_types)) {
// Set the post_content to the custom meta field.
$post_content = $post->post_content;
update_post_meta($post_id, 'post_content', $post_content);
$post->post_content = ''; // Empty the default post_content field.
// Unhook this function so it doesn't loop infinitely.
remove_action('save_post', [ $this, 'save_post_content' ]);
// Update the post, which calls save_post again.
wp_update_post($post);
// Re-hook this function.
add_action('save_post', [ $this, 'save_post_content' ]);
}
}
/**
* Filter the content to get data from the custom meta field.
* @param $content
* @return mixed
*/
public function filter_the_content($content): mixed
{
// Get the current post.
global $post;
// Check if the post type is allowed.
if ($post && in_array($post->post_type, self::$allowed_post_types)) {
// Get the post_content from the custom meta field.
$custom_post_content = get_post_meta($post->ID, 'post_content', true);
if (!empty($custom_post_content)) {
$content = $custom_post_content;
}
}
// Return the content.
return $content;
}
}
new WP_JSON_Search();
If anyone has any suggestions about how I can filter the content in the editor to load data from a custom field that would be so helpful.
Gutenburg's editor uses WordPress's internal REST API. You can tap into that and manipulate the response being sent back.
Add the below filters:
// filter our rest post content
add_filter('rest_post_content', function (array $content, string $type, int $post_id) {
$content['raw'] = 'Updated content!';
return $content;
}, 10, 3);
// filter the rest response
add_filter('rest_post_dispatch', function (WP_Rest_Response $object) {
if (
!property_exists($object, 'data')
|| !array_key_exists('content', $object->data)
|| !array_key_exists('type', $object->data)
|| !array_key_exists('id', $object->data)
) {
return $object;
}
$object->data['content'] = apply_filters(
'rest_post_content',
$object->data['content'],
$object->data['type'],
$object->data['id']
);
return $object;
}, 10, 1);
rest_post_dispatch is an internal WordPress filter, you can check the response and if all the data is there, apply a custom rest_post_content filter to manipulate your data before it gets sent to the Gutenburg editor!