Inventory_Presser_Taxonomy_Overlapper::term_relationship_updated( int $object_id, int $tt_id, string $taxonomy )

	function term_relationship_updated( $object_id, $tt_id, $taxonomy )
	{
		//Does $object_id belong to a vehicle?
		if( INVP::POST_TYPE != get_post_type( $object_id ) )
		{
			//No
			return;
		}

		//Is the taxonomy one that overlaps a meta field?
		$keys_and_taxonomies = $this->overlapping_meta_keys();
		$taxonomies_and_keys = array_flip( $keys_and_taxonomies );
		if( ! in_array( $taxonomy, array_values( $keys_and_taxonomies ) ) )
		{
			//No
			return;
		}

		//An empty array of terms is passed often
		if( empty( $tt_id ) )
		{
			return;
		}


		$term = get_term_by( 'term_taxonomy_id', $tt_id, $taxonomy );
		if( ! is_object( $term ) || 'WP_Term' != get_class( $term ) )
		{
			return;
		}

		//For most taxonomies, we can just save the term name in the post meta field
		if( 'availability' != strtolower( $taxonomy ) )
		{
			$this->hooks_remove_meta();
			update_post_meta( $object_id, apply_filters( 'invp_prefix_meta_key', $taxonomies_and_keys[$taxonomy] ), $term->name );
			$this->hooks_add_meta();

			do_action( 'invp_taxonomy_overlapper_updated_meta', $object_id, $taxonomy, $term );

			return;
		}

		//The availability taxonomy was the one updated
		switch( strtolower( $term->slug ) )
		{
			case "for-sale":
			case "sold":
				$this->hooks_remove_meta();
				update_post_meta( $object_id, apply_filters( 'invp_prefix_meta_key', 'availability' ), $term->name );
				$this->hooks_add_meta();
				break;

			case "wholesale":
				$this->hooks_remove_meta();
				update_post_meta( $object_id, apply_filters( 'invp_prefix_meta_key', 'wholesale' ), true );
				$this->hooks_add_meta();
				break;

			default:
				return; //Makes sure the action hook below only runs after an update
		}

		do_action( 'invp_taxonomy_overlapper_updated_meta', $object_id, $taxonomy, $term );
	}