How can I filter the taxonomy field to show only 2nd level terms?

• tanyamk

• April 17, 2018 at 8:45 pm

The ACF filters for the taxonomy field giving me a way to change the query args,
and not the terms themselves.

I want to be able to override the terms, something like this:

$myTax = get_terms('myTax', array('hide_empty' => 0));

$second_level = array_filter($myTax , function ($t) {
  return $t->parent != 0 && get_term($t->parent, 'myTax')->parent == 0;
});

return $second_level.

How can I solved this issue?

• John Huebner

• April 18, 2018 at 12:04 am

You can’t override the terms shown. ACF does not have a filter for doing this and I don’t think it can be done unless you want to build a custom field type that does this. That’s a lot of work.

My suggestion, and how I would do this would be to use a standard select field. I would dynamically generate the values for the field using your code. https://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/. If I wanted the terms assigned to the posts in WP I would create and acf/load_value and acf/update_value filters so that I could get and set the terms. https://www.advancedcustomfields.com/resources/acf-load_value/, https://www.advancedcustomfields.com/resources/acf-update_value/

• tanyamk

• April 23, 2018 at 8:51 pm

Thanks John,it worked like a charm – I’ve created a multi-select field called “acf-user-schools” and added this:

function acf_load_user_school_field_choices( $field ) {
	
    // reset choices
    $field['choices'] = array();
    
	
               // Get all the schools hierarchy ( Country -> District -> School )
	$schools  = getTaxonomyHierarchy( SCHOOLS_TAXONOMY );
	
	// Get the children (all the districits) of USA
	$schools  = $schools [ USA ]->children;
	
	if ( !empty( $schools  ) AND !is_wp_error( $schools  ) ) 
	{
		foreach( $schools as $district ) 
		{  
			$field['choices'][ $district->term_id ] = $district->name;
		}
	}

    return $field;
    
}
add_filter('acf/load_field/name=acf-user-schools', 'acf_load_user_school_field_choices');