Re: [hibernate-dev] Use cases for many-to-many collection of proxies?
As far as I can tell, "extra-lazy" applies to the collection itself, not its
elements. lazy="extra" is defined on <map>, <set>, <bag>,
<idbag>, <list>.
Currently, an extra-lazy collection can be configured having <many-to-many> with
fetch="select" or outer-join="false". In the case of a map, doing a
lookup by key would not initialize the map (because the map is extra-lazy) and it would
return an uninitialized proxy for the value (because of the fetch="select" or
outer-join="false").
Do you think that would have a real-world application?
Removing the fetch="select" or outer-join="false" functionality from
<many-to-many> on an extra-lazy collection would not change the normal extra-lazy
behavior, avoiding initialization of the collection itself.
Gail
----- Original Message -----
From: "Sanne Grinovero" <sanne(a)hibernate.org>
To: "Gail Badner" <gbadner(a)redhat.com>
Cc: "hibernate-dev" <hibernate-dev(a)lists.jboss.org>
Sent: Monday, October 21, 2013 4:47:58 PM
Subject: Re: [hibernate-dev] Use cases for many-to-many collection of proxies?
Hi Gail,
does this impact as well the "extra-lazy" collections?
I definitely had great use cases for them in the past.
On 21 October 2013 19:22, Gail Badner <gbadner(a)redhat.com> wrote:
> Are there real-world use cases where an initialized many-to-many collection
> should contain elements that are uninitialized proxies (HibernateProxy),
> rather than entity instances?
>
> Currently, it is possible to configure this behavior using either:
>
> <many-to-many ... fetch="select"/>
> <many-to-many ... outer-join="false"/>
>
> We are considering removing this capability if there are no real-world use
> cases.
>
> Fetch profiles do not provide this level of granularity. The fetch style
> for the collection itself, but not its elements, can be configured using a
> fetch profile.
>
> As far as I know, JPA does not provide this level of granularity either.
>
> Please let us know if you are using this functionality.
>
> Thanks,
> Gail
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