Hi Greg,
If this is the case, why would you need to remove items by a specific
offering?
Greg Ederer wrote:
> Hi Marina,
>
> In my model, instances of Offering represent things that a Vendor offers
> for sale. Product and Service directly subclass Offering and are,
> themselves, subclassed by classes representing more specialized kinds of
> products and services (e.g., Subscription, Garment, et cetera).
>
> A ShoppingCartItem has an Offering (as well as a quantity, a unit price,
> a collection of Discounts, et cetera).
>
> I suppose that I could establish a many-to-many relationship between
> Offering and ShoppingCartItem. Does that strike you as being a good idea?
Would it be a many-to-one if item can have only one offering?
The solution most probably depends on the use case. If you don't the remove
quite often, the bulk delete might be a better solution (as long as it doesn't
intervene with the in-memory transaction processing as it happens directly
in the database, and won't affect the cache).
regards,
-marina
>
> Cheers,
>
> Greg
>
> Marina Vatkina wrote:
>
>> Hi Greg,
>>
>> Does it mean that there is no relationship from Offering to Item?
>> Is it worth adding (and maintaining so that they are always at sync)?
>>
>> thanks,
>> -marina
>>
>> Greg Ederer wrote:
>>
>>> Hi,
>>>
>>> I have a method that removes a persistent object from a collection
>>> based on a property of the object being removed, like so:
>>>
>>> /**
>>> * Removes all ShoppingCartItems containing this
>>> * offering
>>> */
>>> public void removeItem(Offering offering)
>>> {
>>> List<ShoppingCartItem> iList = new
>>> ArrayList<ShoppingCartItem>(getItems());
>>> for(ShoppingCartItem i : iList)
>>> {
>>> if(i.getOffering().equals(offering))
>>> {
>>> getItems().remove(i);
>>> }
>>> }
>>> }
>>>
>>> Is this the best way to do this?
>>>
>>> Cheers,
>>>
>>> Greg
>>>
>>> p.s.: I'm so glad I found this list. I feel like I've been groping
>>> in the dark with JPA. Thanks for all the help! --G
>>> --
>>>
>>> | E R G O N O S I S
>>> | Greg Ederer
>>> | Lead Developer
>>> | greg_at_ergonosis.com
>>> | 360.379.1157
>>> | | OpenDocument - OK <http://openoffice.org/>
>>> |
>>>
>>
>
>
> --
>
> | E R G O N O S I S
> | Greg Ederer
> | Lead Developer
> | greg_at_ergonosis.com
> | 360.379.1157
> |
> | OpenDocument - OK <http://openoffice.org/>
> |
>