override addToCart in the Product Sku for doing inventory control

lib/WebGUI/Asset/Sku/Product.pm

@@ -56,6 +56,28 @@ sub addRevision {
     return $newSelf;
 }
 
+#-------------------------------------------------------------------
+
+=head2 addToCart ( variant )
+
+Override/extend Sku's addToCart method to handle inventory control.
+
+=head3 variant
+
+A hashref of variant information for the variant of the Product
+that is being added to the cart.  Adding the variant to the
+cart decrements the quantity by 1.
+
+=cut
+
+sub addToCart {
+    my $self     = shift;
+    my $variant  = shift;
+    $variant->{quantity} -= 1;
+    $self->setCollateral('variantsJSON', 'vid', $variant);
+    $self->SUPER::addToCart($variant);
+}
+
 #-------------------------------------------------------------------
 sub definition {
     my $class = shift;