Hi all,

Sorry if this is mentioned somewhere in the manual and I've missed it.

I have a CartEntity (represents a shopping cart) which has a collection 'CartDetailCollection'. CartDetailEntity is at the top of a TargetPerEntity hierarchy with two sub-types ProductDetailEntity and ContentDetailEntity.

When I load my CartEntity into memory (using prefetch paths to get the associated CartDetailCollection), I would like to be able to get collections of CartDetailEntities based on there type, for example, get all the ProductDetailEntities from my in-memory cart, without another call to the db.

The reason why I don't want to use 'Filtering on entity type' is because I am doing a lot of work to the CartEntity.CartDetailCollection in-memory so I want to avoid having to save the changes to the database and then re-fetch them using GetEntityTypeFilter() as this seems like an unneccessary call to the db.

Here's the method I'm using so far - Is there a better way?

        public static CartDetailCollection GetContentItemsFromCart(CartEntity cart)
        {
            CartDetailCollection contentItems = new CartDetailCollection();
            foreach (CartDetailEntity cartDetailEntity in cart.CartDetail)
            {
                if(cartDetailEntity is ContentDetailEntity)
                {
                    contentItems.Add(cartDetailEntity);
                }
            }
            return contentItems;
        }

Thanks.

Hi,

you can apply the FindMatches(IPredicate) method on your entitycollection and create a predicate with the GetEntityTypeFilter(). So you don't have to re-fetch your collection.

Thanks for that,

That looks like a great method for complicated filters, I'm just wondering if this method is any faster than the method I'm using now or does it pretty much do the dame thing under the covers?

siegemos wrote:

Thanks for that,

That looks like a great method for complicated filters, I'm just wondering if this method is any faster than the method I'm using now or does it pretty much do the dame thing under the covers?

What method do you use now?

The code in my first post

        public static CartDetailCollection GetContentItemsFromCart(CartEntity cart)
        {
            CartDetailCollection contentItems = new CartDetailCollection();
            foreach (CartDetailEntity cartDetailEntity in cart.CartDetail)
            {
                if(cartDetailEntity is ContentDetailEntity)
                {
                    contentItems.Add(cartDetailEntity);
                }
            }
            return contentItems;
        }

I'm sorry but It was not the same user name, so I don't know it was your code

It's a more generic code but it does the same(check for each entities if predicate match or not).

Oh yeh sorry I changed browsers, must have logged me in on my old profile (which I forgot I had).

Thanks for the help.