Advanced Custom Fields – Conditional Logic Not Working for Taxonomy or Post Object Fields in Secondary Languages

Overview of the issue

When using Advanced Custom Fields (ACF) with WPML, you might experience issues with conditional logic not functioning correctly in secondary languages. This happens when the conditional logic depends on fields that use object-based or term-based references, such as taxonomy or post object fields.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Add the following code to your theme’s functions.php file.

  /**
   * WPML Workaround for compsupp-wpmltriage-3649 
   */
  add_action( 'init', function() {
  	if ( defined( 'ICL_SITEPRESS_VERSION' ) ) { 
  		add_filter( 'acf/load_field', function ( $field ) {
  
  			if ( empty( $field['conditional_logic'] ) || ! is_array( $field['conditional_logic'] ) ) {
  				return $field;
  			}
  
  			foreach ( $field['conditional_logic'] as $group_index => $rules ) {
  				if ( ! is_array( $rules ) ) {
  					continue;
  				}
  
  				foreach ( $rules as $rule_index => $rule ) {
  					if ( isset( $rule['field'], $rule['value'] ) && is_numeric( $rule['value'] ) ) {
  						// Fetch the parent field
  						$parent_field = acf_get_field( $rule['field'] );
  						if ( ! isset( $parent_field['type'] ) ) {
  							continue;
  						}
  
  						if ( $parent_field['type'] === 'taxonomy' ) {
  							$rule['value'] = apply_filters( 'wpml_object_id', $rule['value'], $parent_field['taxonomy'], true );
  						} elseif ( $parent_field['type'] === 'post_object' ) {
  							$post_types = $parent_field['post_type'] ?? ''; // can be multiple 
  							if ( is_array( $post_types ) ) {
  								foreach ( $post_types as $post_type ) {
  									$translated_id = apply_filters( 'wpml_object_id', $rule['value'], $post_type, true );
  									if ( $translated_id && $translated_id !== $rule['value'] ) {
  										$rule['value'] = $translated_id;
  										break;								
  									}
  								}
  							} else {
  								$rule['value'] = apply_filters( 'wpml_object_id', $rule['value'], $post_types, true );
  							}
  						}
  						$field['conditional_logic'][ $group_index ][ $rule_index ] = $rule;
  					}
  				}
  			}
  
  			return $field;
  		}, 100 );
  	}
  } );