private void Apply(ProductAdded @event)
{
Version++;
var newProductItem = @event.ProductItem;
var existingProductItem = FindProductItemMatchingWith(newProductItem);
if (existingProductItem is null)
{
ProductItems.Add(newProductItem);
return;
}
ProductItems.Replace(
existingProductItem,
existingProductItem.MergeWith(newProductItem)
);
}
private void Apply(ProductRemoved @event)
{
Version++;
var productItemToBeRemoved = @event.ProductItem;
var existingProductItem = FindProductItemMatchingWith(@event.ProductItem);
if (existingProductItem.HasTheSameQuantity(productItemToBeRemoved))
{
ProductItems.Remove(existingProductItem);
return;
}
ProductItems.Replace(
existingProductItem,
existingProductItem.Substract(productItemToBeRemoved)
);
}
