Save_post and a choice field with dynamic taxonomies

• mathieu

• May 4, 2017 at 7:30 pm

Hi,

I’m making a rather complex structure where i need to order by City, then by Organisation, and then by type of event. It has to be usable in a front-end form as well. I have figured this all out using the great documentation by ACF and WP, but i still stumbled onto a small issue.

I am using City as a taxonomy, with the cities as terms, and the organisations as child terms. Then I dynamically populate a choice field to only show the child terms, so they can’t make a mistake front end of selecting only a city.

This way I get the functionality I wish, but the taxonomy selections don’t get saved to the post. This should be good as, if they are saved, i can use the taxonomy template pages to filter the events by city and by organisation.

I’ve already discovered this post, but I cant seem to get the code working for my case so it seems…

This is my code to dynamically populate the choice field:

function acf_load_color_field_choices( $field ) {

  // reset choices
  $field['choices'] = array();

  $taxonomy = 'gemeente';

  $args = array(
    'taxonomy' => 'gemeente',
    'type' => 'programma',
    'hide_empty' => false,
  );
  //get the child categores
  $categories = get_categories($args);

  foreach ($categories as $category) {

    // var_dump($category);
    $term_children = get_term_children( $category->cat_ID, $taxonomy );

    foreach ( $term_children as $child ) {
      $term = get_term_by( 'id', $child, $taxonomy );
      $term_id = $term->term_id;
      $term_name = $term->name;

      $field['choices'][ $term_id ] = $term_name;

    }

  }

    // return the field
    return $field;

}

add_filter('acf/load_field/name=organisatie', 'acf_load_color_field_choices');

This is the code i’m trying to achieve the selection of taxonomy terms with (just copy-pasted from the other post, but i’ve tried filling in the right field with no success of course):

function my_acf_save_post($post_id) {

    // bail early if no ACF data
    if (empty($_POST['acf'])) {
        return;
    }

    //array of category id's
    $categoryIds = array();

    //value of 'date' field is the cat_id
    $dateCatId = get_field("date");//http://www.advancedcustomfields.com/resources/get_field/
    array_push($categoryIds, $dateCatId);

    //set value of category fields onto post
    //http://codex.wordpress.org/Function_Reference/wp_set_post_categories
    wp_set_post_categories($post_id, $categoryIds);
}

// run before ACF saves the $_POST['acf'] data
//add_action('acf/save_post', 'my_acf_save_post', 1);

// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);

Can anyone tell me what i’m doing wrong? The save_post code seems logically to me, i’ve also did some poking around and some print_r’s, it seems its retrieving ID’s and everything…

Thank you!
Mathieu

• mathieu

• May 8, 2017 at 6:59 pm

Could someone help me with this? Would be very apreciated!

M

• mathieu

• May 9, 2017 at 12:14 am

Glad to say i’ve solved it myself.

In stead of pulling post_categories, i had to pull the terms. Since its in a custom post / taxoomy, I had to pull the object_terms in stead of the post terms.

So I’ve got my terms via $term = get_term_by('id', $dateCatId, 'gemeente'); , gemeente being my taxonomy.

Next problem was that my wp_get_object_terms read the ID as a string and created a new category with the id as slug. Thats why i pull the ID back out on the term like this:
wp_set_object_terms($post_id, $term->term_id, 'gemeente');

Hope i’ve helpen someone with this, and also, if anyone has a better alternative, glad to hear it!

function my_acf_save_post($post_id) {

    // bail early if no ACF data
    if (empty($_POST['acf'])) {
        return;
    }

    //array of category id's
    $categoryIds = array();

    //value of 'date' field is the cat_id
    $dateCatId = get_field('organisatie');//http://www.advancedcustomfields.com/resources/get_field/
    array_push($categoryIds, $dateCatId);

    $term = get_term_by('id', $dateCatId, 'gemeente');

    wp_set_object_terms($post_id, $term->term_id, 'gemeente');
}

// run before ACF saves the $_POST['acf'] data
//add_action('acf/save_post', 'my_acf_save_post', 1);

// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);

• OmniBon

• April 23, 2018 at 2:30 pm

$htmlAfter = '<input type="hidden" name="tax_name" id="tax_name" value="ENTER_MAIN_TAXONOMY_SLUG">';
$htmlAfter .= '<input type="hidden" name="tax_slug" id="tax_slug" value="ENTER_INDIVIDUAL_TAXONOMY_SLUG">';

'html_after_fields' => $htmlAfter

function my_acf_save_post( $post_id ) {
    
   if(isset($_POST['tax_name']) && isset($_POST['tax_slug'])) {
	 wp_set_object_terms( $post_id, $_POST['tax_slug'], $_POST['tax_name'], true );
	}
    
}

// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);

I know it might not be 100% related, but this idea could be applied in MANY ways, considering where ever you include acf_form, you could use whatever variables are available and then include that data in input values and then include those inputs in the html_after_fields or html_before_fields parameter for the acf_form function.