Mandatory redemption coupon for gifted items in WooCommerce

Question

I'm using the below function which currently accepts a single (or array of) static coupon codes. How can I change this to work with any valid (i.e. not already used the maximum times etc.) coupon code that exists in the site?

add_action( 'woocommerce_check_cart_items', 'mandatory_coupon_code' );

function mandatory_coupon_code() {
    $product_categories = array( 'gifts' ); // Category ID or slug of targeted category

    // NEED TO EDIT THIS PART TO GET THE LIST OF VALID CODES
    $coupon_code = 'testing1'; // The required coupon code

    $coupon_applied = in_array( strtolower($coupon_code), WC()->cart->get_applied_coupons() );
    // Loop through cart items
    
    foreach ( WC()->cart->get_cart() as $cart_item ){
        if( has_term( $product_categories, 'product_cat', $cart_item['product_id'] ) && ! $coupon_applied ) {
            wc_clear_notices(); // Clear all other notices
            
            // Avoid checkout displaying an error notice
            wc_add_notice( sprintf( 'The product "%s" requires a valid redemption code for checkout.', $cart_item['data']->get_name() ), 'error' );
        
            break; // stop the loop
        }
    }
}

Edit:

Further to the comments and information from this link, I've tried the below code but this isn't working:

add_action( 'woocommerce_check_cart_items', 'mandatory_coupon_code' );
function mandatory_coupon_code() {
    $product_categories = array( 'gifts' ); // Category ID or slug of targeted category
    $coupon_code = array();
    
    foreach ( $coupons as $coupon ) {
        $coupon_name = $coupon->post_title;
        array_push( $coupon_code, $coupon_name );
    }
    
    $coupon_applied = in_array( strtolower($coupon_code), WC()->cart->get_applied_coupons() );
    
    // Loop through cart items
    foreach ( WC()->cart->get_cart() as $cart_item ){
        if( has_term( $product_categories, 'product_cat', $cart_item['product_id'] ) && ! $coupon_applied ) {
            wc_clear_notices(); // Clear all other notices
            // Avoid checkout displaying an error notice
            wc_add_notice( sprintf( 'The product "%s" requires a valid redemption code for checkout.', $cart_item['data']->get_name() ), 'error' );
            break; // stop the loop
        }
    }
}

Took less then ten seconds of research to find https://www.skyverge.com/blog/get-a-list-of-all-woocommerce-coupons/ — CBroe, Oct 28 '20 at 13:01
@CBroe does the $coupon_names list referred to in that page only include valid codes that haven't yet reached the maximum uses/expired? I thought it would include all of them, which isn't what I need. — Lyall, Oct 28 '20 at 13:07
That info is probably stored in the post metadata table, so you’d need to append that query with a meta data filter on the relevant meta key. — CBroe, Oct 28 '20 at 13:08
@CBroe That's the sort of thing I don't know how to do which is why I posted the question :) — Lyall, Oct 28 '20 at 13:09
WooCommerce already check for coupons validity when they are applied, If they are not valid it displays different warning messages depending on the reason for invalidity, removing invalid applied coupons… So you don't need that. — LoicTheAztec, Oct 28 '20 at 15:39
@LoicTheAztec That makes sense - thank you. I've updated the question as it doesn't seem to be working (I'm probably doing it wrong) — Lyall, Oct 28 '20 at 15:56

LoicTheAztec · Accepted Answer · 2020-10-28T16:46:45.897

As wooCommerce already check for coupons validity when they are applied, If they are not valid it displays different warning messages depending on the reason for invalidity, removing invalid applied coupons…

So you don't need to get all valid coupons in your code… You just need the following:

add_action( 'woocommerce_check_cart_items', 'mandatory_redemption_coupon_code_for_gifted_items' );
function mandatory_redemption_coupon_code_for_gifted_items() {
    $product_categories = array( 'gifts' ); // Term ID, slug or name of targeted category

    $applied_coupons    = WC()->cart->get_applied_coupons();
    
    // When no coupon has been applied
    if( empty($applied_coupons) ) {
        // Loop through cart items
        foreach ( WC()->cart->get_cart() as $item ){
            // Check for gifted items
            if( has_term( $product_categories, 'product_cat', $item['product_id'] ) ) {
                wc_clear_notices(); // Clear all other notices
                
                // Avoid checkout displaying an error notice
                wc_add_notice( sprintf( 'The product "%s" requires a valid redemption code for checkout.', $item['data']->get_name() ), 'error' );
                break; // stop the loop
            }
        }
    }
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works.

Now if the required coupons needs to be specific, you will have make a custom SQL query to check if any applied coupon is valid for redemption.

Note: on your Edit, the coupon query is missing, so that's why it doesn't work.

Mandatory redemption coupon for gifted items in WooCommerce

1 Answers1