plugin development - WooCommerce change Tax Class programmatically when Recalculating an existing Order

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I'm hoping someone can't point me to what I am overlooking.

CIRCUMSTANCE:

We have some unique business logic whereby a custom user meta field affects the appropriate tax class. We have three customer "types" (which is this user meta field, say 'type_one', 'type_two', 'type_three') with three corresponding custom Tax Classes ('class_one', 'class_two', 'class_three').

When we calculate taxes on a Cart, we run a filter on woocommerce_product_get_tax_class and re-assign the Tax Class based on looking up this user meta. It works perfectly for our needs. Sort of (but not exactly, of course) like this:

function reassign_tax_class( $tax_class, $product ) {
    $user = wp_get_current_user();
    if(get_user_meta( $user->ID, '_our_custom_field', true)=='type_one'){
        $tax_class = 'class_one';
    }
    return $tax_class;
}
add_filter( 'woocommerce_product_get_tax_class', 'reassign_tax_class', 1, 2 );

PROBLEM:

We have frequent need to use the Recalculate button on the edit Order page in WP Admin. I cannot find where I can filter or hook the tax class assignment on an order item. It seems to be in the calculate_taxes() method in the class-wc-order-item.php class (line 220: .php#L220 )--and surely enough if insert line 221 there like $calculate_tax_for['tax_class'] = 'class_one' it does exactly what I am looking to do.

Is there a way I can do this without hacking core?

Thanks vastly for any help. I'm at a complete loss and against a clock.

Closed. This question is off-topic. It is not currently accepting answers.

---

Your question should be specific to WordPress. Generic PHP/JS/SQL/HTML/CSS questions might be better asked at Stack Overflow or another appropriate Stack Exchange network site. Third-party plugins and themes are off-topic for this site; they are better asked about at their developers' support routes.

Closed 3 years ago.

Improve this question

I'm hoping someone can't point me to what I am overlooking.

CIRCUMSTANCE:

We have some unique business logic whereby a custom user meta field affects the appropriate tax class. We have three customer "types" (which is this user meta field, say 'type_one', 'type_two', 'type_three') with three corresponding custom Tax Classes ('class_one', 'class_two', 'class_three').

When we calculate taxes on a Cart, we run a filter on woocommerce_product_get_tax_class and re-assign the Tax Class based on looking up this user meta. It works perfectly for our needs. Sort of (but not exactly, of course) like this:

function reassign_tax_class( $tax_class, $product ) {
    $user = wp_get_current_user();
    if(get_user_meta( $user->ID, '_our_custom_field', true)=='type_one'){
        $tax_class = 'class_one';
    }
    return $tax_class;
}
add_filter( 'woocommerce_product_get_tax_class', 'reassign_tax_class', 1, 2 );

PROBLEM:

We have frequent need to use the Recalculate button on the edit Order page in WP Admin. I cannot find where I can filter or hook the tax class assignment on an order item. It seems to be in the calculate_taxes() method in the class-wc-order-item.php class (line 220: https://github/woocommerce/woocommerce/blob/trunk/includes/class-wc-order-item.php#L220 )--and surely enough if insert line 221 there like $calculate_tax_for['tax_class'] = 'class_one' it does exactly what I am looking to do.

Is there a way I can do this without hacking core?

Thanks vastly for any help. I'm at a complete loss and against a clock.

• plugin-development
• woocommerce-offtopic
• filters
• hooks
• user-meta

Share Improve this question edited Jun 9, 2021 at 15:52 vancoder 7,9242828 silver badges3535 bronze badges asked Jun 9, 2021 at 0:46 user19918user19918 3111 silver badge77 bronze badges 3

• You can see that WC_Order_Item_Product (which extends WC_Order_Item) overrides get_tax_class() to fetch $this->get_prop( 'tax_class', $context );. So your filter ought to still work I'd expect? Or maybe you need an equivalent woocommerce_order_item_get_tax_class, I don't know how the filters are constructed. – Rup Commented Jun 9, 2021 at 11:11
• 1 But as always if you need specific WooCommerce help you're better off asking one of their support routes. – Rup Commented Jun 9, 2021 at 11:14
• Thanks, Rup. I'm grateful for your reply. I asked this on WooCommerce community Slack as you advised and got the advice I needed. Will add below. (Here's the link for any future person who wants to try this channel: woocommerce/community-slack ) – user19918 Commented Jun 9, 2021 at 12:10

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1 Answer 1

Sorted by: Reset to default 1

Posting the solution that worked for me in case it helps anyone in the future (Credit to Rup & WooCommerce Community Slack)

I was filtering the tax class getter on the cart side and that was doing what I needed, so I was focused on figuring out how to also filter the tax class getter on the order side. Devinsays on Community Slack recommended the obvious-in-hindsight solution of filtering also the setter on the cart side and then the order side just works without any filter. In other words, when I re-assign the tax class for the calculation on the cart side, actively set it on order creation. Then it will be attached to the order item for the recalculate later. Something like this:

function also_reassign_the_setter($item, $cart_item_key, $values, $order){
    //some custom logic
    $item->set_tax_class('class_one');
}
add_action('woocommerce_checkout_create_order_line_item', 'also_reassign_the_setter', 20, 4);

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