防止添加到购物车，如果购物车包含特定类别（WooCommerce）

Question

我有一个商店，包含5个类别。这是多供应商，由于运输的复杂性，当他们独自在购物车时，我只能从一个特定类别（'油漆'）销售产品。因此，当购物车中含有油漆时，我需要防止添加任何非油漆产品，并显示错误消息，并且我需要防止将油漆产品添加到包含任何其他类别的购物车中，并消除错误消息。

我试着凑齐这些代码片段，我发现躺在Stackoverflow和其他地方。逻辑似乎在我的大脑中工作，但是当我尝试实现代码（通过functions.php）时，它会阻止任何产品被添加到购物车，除非购物车是空的。

这里是我的代码：

//*** Prevent mixture of paint and other prods in same cart ***// 
function dont_add_paint_to_cart_containing_other() { 

// Set flag false until we find a product in cat paint 
$cat_check = false; 

// Set $cat_check true if a cart item is in paint cat 
foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item) { 

    $product = $cart_item['data']; 

    if (has_term('paint', 'product_cat', $product->id)) { 
       $cat_check = true; 
     // break because we only need one "true" to matter here 
     break; 
     } 
} 
// Return true if cart empty 
if (WC()->cart->get_cart_contents_count() == 0) { 
    return true; 
    } 
    // If cart contains paint and product to be added is not paint, display error message and return false. 
    elseif ($cat_check && get_queried_object()->term_id != '245778522') { 
     wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again' , 'error'); 
     return false; 
    } 
    // If cart contains a product that is not paint and product to be added is paint, display error message and return false. 
    elseif (!$cat_check && get_queried_object()->term_id = '245778522') { 
     wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again' , 'error'); 
     return false; 
    } 
    // Otherwise, return true. 
    return true; 
} 

add_filter('woocommerce_add_to_cart_validation', 'dont_add_paint_to_cart_containing_other'); 

Answer 1

//*** Prevent mixture of paint and other prods in same cart ***// 
function dont_add_paint_to_cart_containing_other($validation, $product_id) { 

// Set flag false until we find a product in cat paint 
    $cart_has_paint = false; 

// Set $cat_check true if a cart item is in paint cat 
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item) { 

     $product = $cart_item['data']; 

     if (has_term('paint', 'product_cat', $product->id)) { 
      $cart_has_paint = true; 
      // break because we only need one "true" to matter here 
      break; 
     } 
    } 

    $product_is_paint = false; 
    if (has_term('paint', 'product_cat', $product_id)) { 
     $product_is_paint = true; 
    } 

// Return true if cart empty 
    if (!WC()->cart->get_cart_contents_count() == 0) { 
     // If cart contains paint and product to be added is not paint, display error message and return false. 
     if ($cart_has_paint && !$product_is_paint) { 
      wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again', 'error'); 
      $validation = false; 
     } 
     // If cart contains a product that is not paint and product to be added is paint, display error message and return false. 
     elseif (!$cart_has_paint && $product_is_paint) { 
      wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again', 'error'); 
      $validation = false; 
     } 
    } 
    // Otherwise, return true. 
    return $validation; 
} 

add_filter('woocommerce_add_to_cart_validation', 'dont_add_paint_to_cart_containing_other', 10, 2); 

更改这个

Answer 2

// If cart contains a product that is not paint and product to be added is paint, display error message and return false. 
    elseif (!$cat_check && get_queried_object()->term_id = '245778522') { 
     wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again' , 'error'); 
     return false; 
    } 

更改这个..你如果病情需要 '=='