Lars & Ben,

Thanks for your help…. I think we’ve clarified the problem somewhat, but still not getting what’s needed here. Here’s the current code:

in Product-edit.php:

			$food_type_value = get_post_meta( $object_id, 'wcv_custom_product_food_type', true );
			$food_type_options = array (  
				'vegan'   => __( 'Vegan', 'wcvendors-pro' ),  
				'vegetarian'   => __( 'Vegetarian', 'wcvendors-pro' ),  
				'raw'      => __( 'Raw', 'wcvendors-pro' ),
				'organic'      => __( 'Organic', 'wcvendors-pro' ),
				'gluten-free'      => __( 'Gluten Free', 'wcvendors-pro' ),	
			); 
			
			WCVendors_Pro_Form_Helper::select( apply_filters( 'wcv_custom_product_food_type', array( 
				'post_id'			=> $object_id, 
				'id' 				=> 'wcv_custom_product_food_type[]', 
				'label'   			=> __( 'Food Type (Select all that apply)', 'wcvendors-pro' ), 
				'placeholder'   	=> __( 'Food Type', 'wcvendors-pro' ), 
				'wrapper_start' 	=> '<div class="all-100">',
				'wrapper_end' 		=> '</div>', 
				'desc_tip'   		=> 'false', 
				'taxonomy'			=> 'food_type',
				'taxonomy_args'		=> array( 'hide_empty'=>false ),
				'custom_attributes' => array( 'multiple' => 'multiple' ),
				'options' 			=> $food_type_options,  
				'value'             => $food_type_value
				) )
			);

and in Functions.php:

// Food Type
add_action('woocommerce_product_meta_start', 'wcv_food_type', 2);
function wcv_food_type() {
    $food_types = get_post_meta( get_the_ID(), 'wcv_custom_product_food_type', true ); // Set the meta key
	// If top level array exists
	foreach ($food_types as $key => $value) : 
		echo 'food_types' . $key . ' => ' . $value . '<br>';
	endforeach;
	echo '<br>';
}

add_action( 'wcv_save_product_meta', 'food_type_save_product_meta', 10, 1 );
function food_type_save_product_meta ( $product_id ) {

	// product meta - usage food type
	if ( isset( $_POST[ 'wcv_custom_food_type' ] ) ) { 

		$food_types = $_POST[ 'wcv_custom_food_type' ];
		print_r( $food_types);

		if ( ! empty( $food_types ) ) {
			foreach ( $food_types as $food_type ) { $food_type = wc_clean( $food_type ); }
			update_post_meta( $product_id, 'wcv_custom_food_type', $food_types ); 
			update_post_meta( $product_id, 'food_type', $food_types ); 
		} else {
			delete_post_meta( $product_id, 'wcv_custom_food_type' );
			delete_post_meta( $product_id, 'food_type' );    
		}
	}    
}			

Here’s what’s being reported in the Product Page:

food_types0 => 30
food_types1 => 29

The code is apparently saving the selected ‘food_type’ taxonomy terms to the ‘wcv_custom_product_food_type’ array variable when the vendor adds the options in the product-edit form, and the numerical array values being echoed on the product page are the ID’s of the taxonomy terms. However, the selected options/tax terms are not actually being added to the product from what I can tell on the back end, or on the product-edit form on reload. The terms are not checked on the ‘food_type’ taxonomy’s metabox in the product/post back end editor after saving. They’re also not appearing in the admin column on the back end woocommerce ‘products’ listing page. So… something is still missing, or maybe 2 things are.

First, I’m suspecting that the option values echoed on the front-end product page should be taxonomy term names, and not their numerical values. The numerical values seem to be what’s being saved as the ‘value’ part of the ‘key/value’ pair, and I’m not sure why. Maybe that’s the whole problem?

Second, perhaps the values are not being passed properly from the ‘wcv_custom_product_food_type’ variable to the actual ‘food_type’ taxonomy?

I’m not sure why, still getting my sea legs with PHP, and probably need some hand holding here.

Thanks!

FYI,

I figured out a solution that works for our needs. This is a solution that gets a multi-select field to integrate with a custom taxonomy – basically every time the vendor updates the wc-vendor field multi-select field in the front-end product-edit.php form and saves, the taxonomy terms get updated too. When an admin changes the taxonomy terms via the taxonomy’s metabox on the back end product editor, the array value of the WC Vendor custom field is not updated with the code as it is here. For our purposes, that’s fine, since the code does pull the terms from the taxonomy to populate both the front end product page, and the edit-product form next time the vendor goes to edit the product.

Noting too that this solution isn’t as elegant as Lars’s yet, since it only handles one multi-select custom field + taxonomy at a time, but it’s a good prototype that can be generalized later.

First, create the taxonomy and the terms using a plugin like Custom Post Types UI, or if you’re the hardcode type, create it yourself.

And then here’s the code (set up for our Food Types taxonomy, but replace that with whatever you like:

In Functions.php or a custom plugin…

  
// Food Type - Array/Taxonomy-Connected Field
add_action('woocommerce_product_meta_start', 'wcv_food_type', 2);
function wcv_food_type() {
	$gid = get_the_ID();
    $food_types = get_post_meta( $gid, 'wcv_custom_product_food_type', true ); // Set the meta key
	$food_types_terms = (array)get_the_terms( $gid, 'food_type' );

	echo '<h3>Food Types</h3>';

	// Note that this calls the Taxonomy that's associated with the WC Vendors variable
	foreach ($food_types_terms as $key => $value) {
		$food_types_term = get_term( $value , 'food_type' );
		$h = $food_types_term->name;
		$i = wc_clean($h);
		echo $i . '<br>';
	 }
	echo '<br>';
}

add_action( 'wcv_save_product_meta', 'food_type_save_product_meta', 10, 1 );
function food_type_save_product_meta ( $product_id ) {
	
	$food_types_names = array();												      // Create an array that will recieve the tax names
	
	if ( isset( $_POST[ 'wcv_custom_product_food_type' ] ) ) { 

   		$food_types = get_post_meta( $product_id, 'wcv_custom_product_food_type', true ); // Get the wcv array values
		
		if ($food_types) {
		
			foreach ($food_types as $key => $value) {
				$food_type_name = get_term( $value , 'food_type' );
				$f = $food_type_name->name;
				$g = wc_clean($f);
				$food_types_names[] = $g;
			}
			wp_set_object_terms( $product_id, $food_types_names , 'food_type' );
			}	}
		
	else {
		delete_post_meta( $product_id, 'wcv_custom_product_food_type' );			// delete the contents of the wcv variable
		wp_set_object_terms( $product_id, NULL , 'food_type' );  					// and delete the contents of the taxonomy			
		}			
	}	

and in product-edit.php…

			// Food Type Custom Field
			
			$food_type = (array)get_the_terms( $object_id, 'food_type' );
			
			WCVendors_Pro_Form_Helper::select2( apply_filters( 'wcv_custom_product_food_type', array( 
				'post_id'			=> $object_id, 
				'id' 				=> 'wcv_custom_product_food_type[]', 
				'label'   			=> __( 'Food Type (Select all that apply)', 'wcvendors-pro' ), 
				'placeholder'   	=> __( 'Food Type', 'wcvendors-pro' ), 
				'wrapper_start' 	=> '<div class="all-100">',
				'wrapper_end' 		=> '</div>', 
				'desc_tip'   		=> 'false', 
				'taxonomy'			=> 'food_type',
				'taxonomy_args'		=> array( 'hide_empty'=>false ),
				'value' 			=> $food_type,
				'custom_attributes' => array( 'multiple' => 'multiple' )
				
				) )
			);	

Note also that for the ability to multi-select, for us it seemed only to work with the ‘select2’ input class, and not at all with the ‘select’ class.

Hope this is of service.