Solvedacf to rest api How to get ACF post object field with ACF fields

Hey, maybe I am missing something, but I am having trouble retrieving custom post ACF data within a post object field.

I have a custom post type call Rentals where I have set up ACF fields.

I can retrieve all of the acf data by getting /wp-json/wp/v2/rentals/{id}

When I create a page with an ACF Post Object field where I select a specific rental, I don't see any of the ACF data in the response. When I get /wp-json/wp/v2/pages/{id} I get this response: data
"acf": {
    "rental": {
      "ID": 191,
      "post_author": "1",
      "post_date": "2017-02-28 18:24:35",
      "post_date_gmt": "2017-02-28 18:24:35",
      "post_content": "",
      "post_title": "Rental 1",
      "post_excerpt": "",
      "post_status": "publish",
      "comment_status": "closed",
      "ping_status": "closed",
      "post_password": "",
      "post_name": "rental-1",
      "to_ping": "",
      "pinged": "",
      "post_modified": "2017-02-28 18:24:35",
      "post_modified_gmt": "2017-02-28 18:24:35",
      "post_content_filtered": "",
      "post_parent": 0,
      "guid": "",
      "menu_order": 0,
      "post_type": "rentals",
      "post_mime_type": "",
      "comment_count": "0",
      "filter": "raw"

How do I set it up so the ACF data is included within that Post Object field?

35 Answers

βœ”οΈAccepted Answer

Hi @travis-zookacreative,
Thanks for using my plugin, bellow I wrote an example most generic.


add_filter( 'acf/rest_api/{type}/get_fields', function( $data ) {
	if ( ! empty( $data ) ) {
		array_walk_recursive( $data, 'get_fields_recursive' );

	return $data;
} );


add_filter( 'acf/rest_api/{type}/get_fields', function( $data, $request, $response ) {
	if ( $response instanceof WP_REST_Response ) {
		$data = $response->get_data();

	if ( ! empty( $data ) ) {
		array_walk_recursive( $data, 'get_fields_recursive' );

	return $data;
}, 10, 3 );

Function to use for both versions:

function get_fields_recursive( $item ) {
	if ( is_object( $item ) ) {
		$item->acf = array();
		if ( $fields = get_fields( $item ) ) {
			$item->acf = $fields;					
			array_walk_recursive( $item->acf, 'get_fields_recursive' );

Other Answers:

Instead of defining it for every possible post type. I added a $types array so it loops through the types and also uses it for the array_walk_recursive() function.

 * ACF Data in Post Object Response

$types = ['post', 'page', 'product']

foreach ($types as $type) {
  add_filter( 'acf/rest_api/'.$type.'/get_fields', function( $data, $response ) use ($types) {

    if ( $response instanceof WP_REST_Response ) {
      $data = $response->get_data();

    array_walk_recursive( $data, 'deepIncludeACFFields', $types );

    return $data;

  }, 10, 3 );

function deepIncludeACFFields( &$item, $key, $postTypes ) {
  if ( isset( $item->post_type ) && in_array( $item->post_type, $postTypes ) ) {
    $item->acf = get_fields( $item->ID );

I like @StevenDaoud's solution for adding the fields to the top level object. I opted to follow the plugin's format of placing all the fields in the acf key. Both adding to the response as opposed to replacing it.

Also, I was getting an error with function( $data, $request, $response ) so I removed $request and it appears to be working. Not sure why mine was giving me the error, guess it's possible it's been deprecated.

here is a cleaner way for anyone else who finds this issue:

add_filter( 'acf/rest_api/page/get_fields', function( $data, $request, $response ) {
    if ( $response instanceof WP_REST_Response ) {
        $data = $response->get_data();

    array_walk_recursive( $data, 'deepIncludeACFFields', array( 'rentals' ) );

    return $data;
}, 10, 3 );

function deepIncludeACFFields( &$item, $key, $postTypes ) {
    if ( isset( $item->post_type ) && in_array( $item->post_type, $postTypes ) ) {
        $item = get_fields( $item->ID );

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