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add Relationship field to the wp_search

  • Has anyone found a solution how to make wp_search in relationship fields. ex
    search for Al Pacino -> result The godfather. As the custom post_type actor is linked to custom post_type film by relationship.

  • Hi @squaremunkey,

    Thanks for the post.

    I came across the following snippet that creates this functionality.

    You will need to add the following code to your functions.php file:

    // in this case we have three ACF Relationship fields set up, they have the names
    // acf_rel_1, acf_rel_2, and acf_rel_3 (NOTE: these are the NAMES not the labels)
    // ACF stores post IDs in one form or another, so indexing them does us no good,
    // we want to index the title of the related post, so we need to extract it
    function my_searchwp_custom_fields( $customFieldValue, $customFieldName, $thePost ) {
      // by default we're just going to send the original value back
      $contentToIndex = $customFieldValue;
      // check to see if this is one of the ACF Relationship fields we want to process
      if( in_array( strtolower( $customFieldName ), array( 'acf_rel_1', 'acf_rel_2', 'acf_rel_3' ) ) ) {
        // we want to index the titles, not the post IDs, so we'll wipe this out and append our titles to it
        $contentToIndex = '';
        // related posts are stored in an array
        if( is_array( $customFieldValue ) ) {
          foreach( $customFieldValue as $relatedPostData ) {
            if( is_numeric( $relatedPostData ) ) { // if you set the Relationship to store post IDs, it's numeric
              $title = get_the_title( $relatedPostData );
              $contentToIndex .= $title . ' ';
            } else { // it's an array of objects
              $postData = maybe_unserialize( $relatedPostData );
              if( is_array( $postData ) && !empty( $postData ) ) {
                foreach( $postData as $postID ) {
                  $title = get_the_title( absint( $postID ) );
                  $contentToIndex .= $title . ' ';
      return $contentToIndex;
    add_filter( 'searchwp_custom_fields', 'my_searchwp_custom_fields', 10, 3 );
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