Fractional quantities or custom quantities by product category

Changes quantity steps by specific product categories. Must be activated on both front and back ends (run everywhere setting).

// Define steps by category
function ccom_get_step_by_product_category( $product_id ) {

	// Categories in priority order
	if( has_term( 'wheels', 'product_cat', $product_id ) ) {
		return 2;
	}
	if( has_term( 'tires', 'product_cat', $product_id ) ) {
		return 2;
	}
	if( has_term( 'fabrics', 'product_cat', $product_id ) ) {
		return 0.25;
	}

	// Default to one
	return 1;
}

// Update min value to the quantity field
add_filter( 'woocommerce_quantity_input_min',
	function( $default, $product ) {

	$product_id = $product->get_id();

	return ccom_get_step_by_product_category( $product_id );

}, 10, 2 );

// Update step value to the quantity field
add_filter( 'woocommerce_quantity_input_step',
	function( $default, $product ) {

	$product_id = $product->get_id();

	return ccom_get_step_by_product_category( $product_id );

}, 10, 2 );

// Replace the WooCommerce filter that is validating the quantity
remove_filter( 'woocommerce_stock_amount', 'intval' );
add_filter( 'woocommerce_stock_amount', 'floatval' );

How to use

  1. Log into a staging, development, or locally hosted clone of your site
  2. Install and activate Code Snippets
  3. WP Admin > Snippets > Add New
  4. Copy and paste the code from the Description tab above
  5. Check to ensure formatting came over properly and no syntax errors show up in the editor
  6. Customize the code as desired
  7. Add a meaningful title
  8. Select whether to run on front-end or back-end (or both)
  9. Click “Save and Activate”
  10. Test your site to ensure it works
  11. Disable if any problems, or recover
  12. Repeat for live environment

License

All code snippets are licensed GPLv2 (or later) matching WordPress licensing.

Disclaimer of warranty:

Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

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  2. Describe your expected outcome(s).
  3. List steps to reproduce the issue.
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