Add a custom taxonomy to WooCommerce import/export

add-taxonomy-to-woocommerce-export.php

<?php
/*
* Plugin Name: WooCommerce Add Taxonomy to Export
* Plugin URI: https://gist.github.com/helgatheviking/114c8df50cabb7119b3c895b1d854533/
* Description: Add a custom taxonomy to WooCommerce import/export.
* Version: 1.0.1
* Author: Kathy Darling
* Author URI: https://kathyisawesome.com/
*
* Woo: 18716:fbca839929aaddc78797a5b511c14da9
*
* Text Domain: woocommerce-product-bundles
* Domain Path: /languages/
*
* Requires at least: 5.0
* Tested up to: 5.0
*
* WC requires at least: 3.5
* WC tested up to: 3.5.4
*
* Copyright: © 2017-2019 SomewhereWarm SMPC.
* License: GNU General Public License v3.0
* License URI: http://www.gnu.org/licenses/gpl-3.0.html
*/

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
/**
* Add CSV columns for exporting extra data.
*
* @param  array  $columns
* @return array  $columns
*/
function kia_add_columns( $columns ) {
	$columns[ 'custom_taxonomy' ] = __( 'Your taxonomy', 'your-text-domain' );
	return $columns;
}
add_filter( 'woocommerce_product_export_column_names', 'kia_add_columns' );
add_filter( 'woocommerce_product_export_product_default_columns', 'kia_add_columns' );


/**
* MnM contents data column content.
*
* @param  mixed       $value
* @param  WC_Product  $product
* @return mixed       $value
*/
function kia_export_taxonomy( $value, $product ) {

	$terms = get_terms( array( 'object_ids' => $product->get_ID(), 'taxonomy' => 'your-taxonomy-slug' ) );

	if ( ! is_wp_error( $terms ) ) {

		$data = array();

		foreach ( (array) $terms as $term ) {
			$data[] = $term->term_id;
		}

		$value = json_encode( $data );

	}

	return $value;
}
add_filter( 'woocommerce_product_export_product_column_custom_taxonomy', 'kia_export_taxonomy', 10, 2 );



/**
 * Import
 */


/**
 * Register the 'Custom Column' column in the importer.
 *
 * @param  array  $columns
 * @return array  $columns
 */
function kia_map_columns( $columns ) {
	$columns[ 'custom_taxonomy' ] = __( 'Your taxonomy', 'your-text-domain' );
	return $columns;
}
add_filter( 'woocommerce_csv_product_import_mapping_options', 'kia_map_columns' );


/**
 * Add automatic mapping support for custom columns.
 *
 * @param  array  $columns
 * @return array  $columns
 */
function kia_add_columns_to_mapping_screen( $columns ) {

	$columns[ __( 'Your taxonomy', 'your-text-domain' ) ] 	= 'custom_taxonomy';

	// Always add English mappings.
	$columns[ 'Your taxonomy' ]	= 'custom_taxonomy';

	return $columns;
}
add_filter( 'woocommerce_csv_product_import_mapping_default_columns', 'kia_add_columns_to_mapping_screen' );


/**
 * Decode data items and parse JSON IDs.
 *
 * @param  array                    $parsed_data
 * @param  WC_Product_CSV_Importer  $importer
 * @return array
 */
function kia_parse_taxonomy_json( $parsed_data, $importer ) {

	if ( ! empty( $parsed_data[ 'custom_taxonomy' ] ) ) {

		$data = json_decode( $parsed_data[ 'custom_taxonomy' ], true );

		unset( $parsed_data[ 'custom_taxonomy' ] );

		if ( is_array( $data ) ) {

			$parsed_data[ 'custom_taxonomy' ] = array();

			foreach ( $data as $term_id ) {
				$parsed_data[ 'custom_taxonomy' ][] = $term_id;
			}
		}
	}

	return $parsed_data;
}
add_filter( 'woocommerce_product_importer_parsed_data', 'kia_parse_taxonomy_json', 10, 2 );


/**
 * Set taxonomy.
 *
 * @param  array  $parsed_data
 * @return array
 */
function kia_set_taxonomy( $product, $data ) {

	if ( is_a( $product, 'WC_Product' ) ) {

		if( ! empty( $data[ 'custom_taxonomy' ] ) ) {
			wp_set_object_terms( $product->get_id(),  (array) $data[ 'custom_taxonomy' ], 'your-taxonomy-slug' );
		}

	}

	return $product;
}
add_filter( 'woocommerce_product_import_inserted_product_object', 'kia_set_taxonomy', 10, 2 );

Thanks so much for this code! I created a reusable class for this since I've needed it a few times. This version also uses comma-separated term slugs instead of IDs, so it's more readable and easier to use when importing products for the first time since it will create terms from the slug.

https://gist.github.com/JiveDig/7abe617b34c5f0ba659269834b9f00c4

@JiveDig thanks for sharing!!

hi all is there any solution for supporting hierarchical taxonomy ??

What about that isn't working? I'm not really maintaining this and am on holiday. I'd probably take a look at JiveDig's adjustment above