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get_field_object return false

  • Hi everybody,
    I’m using the function get_field_object in a custom post type archive for filter some parameters.

    I’ve followed this tutorial:

    On the archive-cars.php everything it’s working fine. When I try to use the same code on a category field I get a warning because the $field = get_field_object($key, false, true);
    doesn’t get any result but return false..

    Do you know Why?

    “Ivalid argument supplied for foreach() in /Applications/MAMP/htdocs/www.rr1985.localhost/wp-content/themes/rr1985/template-parts/archive-cars-filter.php on line 29”


    <?php foreach( $GLOBALS['my_query_filters'] as $key => $name ):
          // get the field's settings without attempting to load a value
          $field = get_field_object($key, false, true);
          // create filter ?>
          <h3><b><?php echo $name; ?></b></h3>
          <div class="filter" data-filter="<?php echo $name; ?>">
            <?php  //Print the list in a checbox
            if ($field) :
              // BUG: funziona solo se trova risultati o nell'url iniziale
              foreach ($field['choices'] as $choice_value => $choice_label) :
                $checkAtt = '';
                // set value if available
                if( isset($_GET[ $name ]) ) {
                  $values = explode(',', $_GET[ $name ]);
                  if (in_array($choice_value, $values, false) ){
                    $checkAtt = "checked";
                    <input name="brand" type="checkbox" value="<?php echo $choice_value;?>" <?php echo $checkAtt; ?>/>
                    <span><?php echo $choice_label; ?></span>
            <?php endforeach;?>
          <?php endif;?>
        <?php endforeach; ?>
  • The reason is likely that a value has never been saved for this field for the current post and you are using the field name in $key. Under this condition you need to use the field key instead of the field name.

    You can solve this by building an array like this

    $fields = array(
      // field name => key pairs
      'name-of-field-1' => 'field_123456',
      'name-of-field-2' => 'field_234567',
      // etc...

    Then use

    $field = get_field_object($field[$key], false, true);
  • Thanks a lot John for the reply.
    I saved the value in a global array on my functions.php (or at least I think so..)

    Any clue why on the archive-cars.php is working and in the category.php isn’t?

    Here my functions.php file

     * Archive cars FILTER using pre get post?
     // array of filters
     //NOTE: it's a sub field inside a field group so the meta query becomes => groupname_subfield
    	$GLOBALS['my_query_filters'] = array(
    	 'car_info_petrol'	=> 'carburante',
    	 'car_info_gearshift'	=> 'cambio',
    	 'car_info_brand'	=> 'marca'
     function my_pre_get_posts( $query ) {
     	// do not modify queries in the admin
     	if( is_admin() ) {return $query;}
     	// only modify queries for 'cars' post type
     	if( isset($query->query_vars['post_type']) && $query->query_vars['post_type'] == 'cars' ) {
    		// loop over filters
    		foreach( $GLOBALS['my_query_filters'] as $key => $name ) {
    			//allow the url to alter the query
    	 		if( isset($_GET[$name]) ) {
    				$meta_query[] = array(
    					'key' => $key,
    					'value' => $_GET[$name],
    					'compare' => 'IN'
    				//Update the meta query args
    				$query->set('meta_query', $meta_query);
     	} //End of the if only on the post type cars
     	// return
     	return $query;
     add_action('pre_get_posts', 'my_pre_get_posts');
  • I don’t know why it might work in one location and not in another. The only thing that I do know is that get_field_object() will fail if the field has never been set and you use the field name but it should work when using the field key.

  • Thanks John that fixed my issue.

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