ccmtrotter

I’ve tried using this code:

//
/**
 * Renders notices and prevents checkout if the cart
 * does not contain a minimum number of products in a category
 */
function sww_check_category_for_minimum() {
	// set the minimum quantity in the category to purchase
	$min_quantity = 1;
	// set the id of the category for which we're requiring a minimum quantity
	$category_id = 90;
	// get the product category
	$product_cat = get_term( $category_id, 'product_cat' );
	$category_name = '<a href="' . get_term_link( $category_id, 'product_cat' ) . '">' . $product_cat->name . '</a>';
	// get the quantity category in the cart
	$category_quantity = sww_get_category_quantity_in_cart( $category_id );
	if ( $category_quantity < $min_quantity ) {
		// render a notice to explain the minimum
		wc_add_notice( sprintf( '<strong>A minimum quantity of the choosen Brewer has not been met. <br /> (Kuerig 140 Reqiures A Minimum of 4 Boxes to Order)<br />(Kuerig 150 Reqiures A Minimum of 8 Boxes to Order)<br />(Kuerig K3000SE Reqiures A Minimum of 12 Boxes to Order)<br />(Kuerig Bolt Carafe Reqiures A Minimum of 10 Boxes to Order)</strong><br />'), 'error' );
	}
}
add_action( 'woocommerce_check_cart_items', 'sww_check_category_for_minimum' );
/**
 * Returns the quantity of products from a given category in the WC cart
 *
 * @param int $category_id the ID of the product category
 * @return in $category_quantity the quantity of products in the cart belonging to this category
 */
function sww_get_category_quantity_in_cart( $category_id ) {
	// get the quantities of cart items to check against
	$quantities = WC()->cart->get_cart_item_quantities();

	// start a counter for the quantity of items from this category
	$category_quantity = 0;
	// loop through cart items to check the product categories
	foreach ( $quantities as $product_id => $quantity ) {
		$product_categories = get_the_terms( $product_id, 'product_cat' );

		// check the categories for our desired one
		foreach ( $product_categories as $category ) {
			// if we find it, add the line item quantity to the category total
			if ( $category_id === $category->term_id ) {
				$category_quantity += $quantity;
			}
		}
	}
	return $category_quantity;
}

The code displays on the cart page and prevents you from checking out even if you have the right product categories. I do not know how to check to see if the right product ID is in the cart for the function to run and display the error.

That looks like that may work, thank you, Mike Jolley!

Before I test it out do you know if I add multiple items to the dependency? For example, product A can only be added onto the cart if a minimum of products from X, Y, Z are in the cart?

So I have to have 10 X’s or 5 X’s and 5 Y’s in the cart before I can add product A.