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 );

Typo in line 65: $columns should be $options

Typo: in line 130: should be $product->get_id();

line 40: $data[] = $term->name; -> if you prefer Name instead ID to print in CSV cell
line 43: $data[] = $value = str_replace(array('["','"]'), '', json_encode( $data ) ); -> this trick removes [""] form CSV cell
lines 96-115: $parsed_data[ 'Taxonomy Name" ] -> you should remember, that is this place value is the name of Column, not taxonomy slug!

This is really a very useful code. Thank you all so much. I was able to get the export work but somehow I am not been able to get the import. Should the Import CSV contain term slug or term id? Tried both but not working. I have added my code here, any help is much appreciated. Here shop_section is the name of my custom taxonomy.

/**
 * Import shop section of the products from the CSV file
 */

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

	// Always add English mappings.
	$columns[ 'Shop Section' ]	= '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'], 'shop_section' );
		}

	}

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

I too had issues getting the import of custom tax terms working as @malavikaprav. Figured out that the $product doesn't have an ID yet when woocommerce_product_import_pre_insert_product_object action is triggered. If anyone else is fiddling with this issue i solved it by adding $product->save() and wp_set_object_terms() afterwards.

@rbsmidt, would you be willing to add your code to this thread? I'm either doing something goofy or I'm missing a step.

@Red-N-Dusty sure thing

The trick that worked for me was to do a save on the WC_Product object before adding the term through wp_set_object_terms. For clarification my custom taxonomy is called "collections", and in the CSV file i add the actual name of the collection (not the slug), which is used to fetch the term with get_term_by-helper function.
Hope it helps! My function below:

function process_import($object, $data) {
    if (is_a($object, 'WC_Product')) {
        if (!empty($data['collections'])) {
            // Save object to assign correct product id
            $object->save();
            $collection = get_term_by('name', $data['collections'], 'collections');
	    if ($collection) {
		wp_set_object_terms($object->get_id(), $collection->term_id, 'collections');
	    }
        }
    }
    return $object;
}
add_filter( 'woocommerce_product_import_pre_insert_product_object', 'process_import', 10, 2 );

Thanks, @rbsmidt. After messing around with it for a few hours, I got it all to work as you described. At first, it was dropping long strings of terms separated by commas (ie. "foo1, bar1, foo2, bar2") into the taxonomy post. I resolved that by building an array and passing it to wp_set_object_terms().

I'll include my code but its pretty duplicitous between the pre_insert and insert filters. Maybe someone else has a better answer. Unfortunately, I'll have to come back to this later but for some reason, one won't work without the other.

function process_import($object, $data) {
    if (is_a($object, 'WC_Product')) {
        if (!empty($data['Part Number'])) {
            // Save object to assign correct product id
            $object->save();
			$terms = array();
			$part_numbers = $data['Part Number'];
			$part_numbers = explode(",",$part_numbers);
			
			foreach($part_numbers as $part_number){
				$part_number = get_term_by('name', $part_number, 'Part Number');
				$terms[]=$part_number->term_id;
			}
			
            
            if ($part_number) {
                wp_set_object_terms($object->get_id(), $terms, 'part_number');
            }
        }
    }
    return $object;
}
add_filter( 'woocommerce_product_import_pre_insert_product_object', 'process_import', 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[ 'part_number' ] ) ) {
			$terms = array();
			$part_numbers = $data['part_number'];
			if(strpos($part_numbers, ",")){
				$part_numbers = explode(",",$part_numbers);
				foreach($part_numbers as $part_number){
					$part_number = get_term_by('name', $part_number, 'part_number');
					$terms[] = $part_number->term_id;
				}
				wp_set_object_terms( $product->get_id(),  $terms, 'part_number' );
			}else{
				wp_set_object_terms( $product->get_id(),  (array) $part_numbers, 'part_number' );
			}
		}

	}

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

@rbsmidt, I had a feeling that was wrong. I managed to get those previous functions to work once and that was only because I had already imported the terms using a different plugin while trying to find the answer to this problem. In the process of troubleshooting my error, I was able to combine the two functions. This is what I've come up with and I've put it through its paces already.

/**
 * Set taxonomy.
 *
 * @param  array  $parsed_data
 * @return array
 */

function kia_set_taxonomy( $product, $data ) {
	if ( is_a( $product, 'WC_Product' ) ) {
		if( ! empty( $data[ 'part_number' ] ) ) {
            		$product->save();
            		$part_numbers = $data[ 'part_number' ];
            		$part_numbers = explode(",", $part_numbers);
            		$terms = array();
            		foreach($part_numbers as $part_number){
                		if(!get_term_by('name', $part_number, 'part_number')){
                    			$partNumArgs= array(
                        			'cat_name' => $part_number,
                        			'taxonomy' => 'part_number',
                    			);
                    			$part_number_cat = wp_insert_category($partNumArgs);
                    			array_push($terms, $part_number_cat);
                		}else{
                    			$part_number_cat = get_term_by('name', $part_number, 'part_number')->term_id;
                    			array_push($terms, $part_number_cat);
                		}
            		}
			wp_set_object_terms( $product->get_id(),  $terms, 'part_number' );
		}
	}
	return $product;
}
add_filter( 'woocommerce_product_import_inserted_product_object', 'kia_set_taxonomy', 10, 2 );

Here you go, just change the taxonomy name "suppliers" to your existing custom taxonomy name, and don't forget to change the column name as well in the CSV file, once done, you only need to add the taxonomy term name you want to assign the products to into the column cells.

Cheers!

function add_column_to_importer( $options ) {

  // column slug => column name
  $options['suppliers'] = 'Suppliers';

  return $options;
}
add_filter( 'woocommerce_csv_product_import_mapping_options', 'add_column_to_importer' );


function add_column_to_mapping_screen( $columns ) {
  
  // potential column name => column slug
  $columns['Suppliers'] = 'suppliers';

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


function process_import($object, $data) {
    if (is_a($object, 'WC_Product')) {
        if (!empty($data['suppliers'])) {
            // Save object to assign correct product id
            $object->save();
            wp_set_object_terms( $object->get_id(),  $data['suppliers'], 'suppliers' );
        }
    }
    return $object;
}
add_filter( 'woocommerce_product_import_pre_insert_product_object', 'process_import', 10, 2 );