Hi,
do you have some sort of example or tutorial for the many to many relations
?
When I have tried using them, I got really strange exception.
Twig was not able to determine the key for some dependent entities...I think
I was doing smth wrong...
I will describe the problem in with more details a little bit later...
Sincerely,
Michael Shtelma
On Mon, May 3, 2010 at 12:46 PM, jd <jdpatter...@gmail.com> wrote:
> Yep, many to many relationships work well. They can also be
> polymorhic and use inheritance with no problems.
>
> On May 3, 12:09 am, Michael Shtelma <mshte...@gmail.com> wrote:
> > Hi all,
> >
> > I have looked at twig, I liked it a lot, but there is one issue about
> many
> > to many relationships. Does Twig support them?
> >
> > Sincerely,
> > Michael Shtelma
> >
> > On Sun, Mar 28, 2010 at 5:25 PM, John Patterson <jdpatter...@gmail.com
> >wrote:
> >
> >
> >
> > > There are alternatives: Twig, Objectify, SimpleDS, Slim3, Siena. Take
> your
> > > pick and get your app working today.
> >
> > > On 28 Mar 2010, at 21:47, Trung wrote:
> >
> > > Hi GAE team,
> >
> > >> Any workarounds for this issue?
> >
> > >> Thanks
> >
> > >> On Feb 14, 8:55 am, Payam <pmoghad...@gmail.com> wrote:
> >
> > >>> The problem is still not solved.
> > >>> Although you can "persist" an object with multiple relations of the
> > >>> same type. When you actually query the object, the retrieved object
> > >>> has duplicates for the multiple relations.
> > >>> As in, if I were to persist instances A, B inside C. When I query for
> > >>> C, both objects retrieved will be A. There will be no B.
> >
> > >>> This is a serious bug!
> >
> > >>> On Jan 26, 4:54 pm, oth <other...@gmail.com> wrote:
> >
> > >>> Michael,
> >
> > >>> In your jdoconfig.xml file add this entry:
> >
> > >>> <property
> > >>>> name="datanucleus.appengine.allowMultipleRelationsOfSameType"
> > >>>> value="true"/>
> >
> > >>> Thanks
> >
> > >>> On Jan 26, 3:12 pm, Michael Shtelma <mshte...@gmail.com> wrote:
> >
> > >>> Hi all,
> >
> > >>> I am also experiencing this problem on GAE 1.3.0.
> > >>>>> Using multipleRelationsOfSameTypeAreErrors helps not in all cases,
> > >>>>> when I am trying to read such entities I get mentioned exception.
> > >>>>> Are the any solution for the 1.3.0 ?
> >
> > >>> Thanks,
> > >>>>> Michael
> >
> > >>> On Jan 21, 9:20 am, cowper <iamco...@gmail.com> wrote:
> >
> > >>> Hi,
> > >>>>>> I have a similar issue with 1.3.0 however it arises when the
> types
> > >>>>>> are the same and not related to inheritance of any type.
> >
> > >>> The work around suggested doesn't seem to work. Is the workaround
> > >>>>>> valid for 1.3.0?
> >
> > >>> thx,
> >
> > >>> Conor
> >
> > >>> On Dec 4 2009, 9:52 pm, "Max Ross (Google)" <maxr
> >
> > >>> +appeng...@google.com> wrote:
> >
> > >>>>>>> SDK 1.2.8 contains a new check that detects if one of your JDO or
> JPA
> > >>>>>>> model
> > >>>>>>> objects has two relationship fields of the same type. For
> example:
> >
> > >>> class A {
> > >>>>>>> List<B> bList;
> > >>>>>>> List<B> anotherBList;
> >
> > >>> }
> >
> > >>> Unfortunately I was a little too aggressive with this check, so the
> > >>>>>>> following also run afoul of the check:
> >
> > >>> abstract class B {}
> >
> > >>> class C extends B {}
> > >>>>>>> class D extends B {}
> >
> > >>> class A {
> > >>>>>>> List<C> cList:
> > >>>>>>> List<D> dList;
> >
> > >>> }
> >
> > >>> If you get an exception that says
> >
> > >>> Class XXX has multiple relationship fields of type YYYY. This is
> not
> > >>>>>>> yet
> > >>>>>>> supported.
> >
> > >>> and your class hierarchy resembles the one above, you can disable
> this
> > >>>>>>> check
> > >>>>>>> by with the following config property:
> >
> > >>> <property
> > >>>>>>> name="datanucleus.appengine.multipleRelationsOfSameTypeAreErrors"
> > >>>>>>> value="true"/>
> >
> > >>> We'll get this fixed shortly.
> >
> > >>> Sorry for the trouble,
> > >>>>>>> Max
> >
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