[appengine-java] Re: Problem persist JDO- one to many
Thanks Prashant, but not understand...That would be to do detach b including all of its collections of child entities?Example of code? The objects "Equipo" is created in my database, but when get for Torneo b = pm.getObjectById(Torneo.class, idTorneo); the b.getEquiposTorneo that is a collection is null. The name for example is getting, but not the collection...I have a singleton pattern for the Persistent manager for all the system.If I close it,lose the functionality. Regards On 11 jul, 15:04, Prashant wrote: > before returning b (Torneo), if you are closing PersistentManger you must > detach b including all of its collections of child entities. > > -- > Prashantwww.claymus.com -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Problem persist JDO- one to many
Hi! Prashant/Hariharan. The problem was that I don´t have the
annotation in the collection:
@Persistent(mappedBy = "torneo", defaultFetchGroup = "true")
private List equiposTorneo;
The defaultFetchGroup = "true" is critical and in the documentation of
google it is not...
I did not have to detach collections fields...
Regards
On 12 jul, 12:43, Hariharan Anantharaman
wrote:
> Hi Lisan,
> In the Torneo class, i am not seeing "mappedBy" attribute for @persistent
> tage for field
>
> private List equiposTorneo;
>
> That is required to make this a owned one-many collection. Only then it
> might be possible to get collection of Equipo when retrieving Torneo .
>
> Thanks
> Hari
>
> 2010/7/12 Prashant
>
> > you need to create a new method in Torneo which will detach collections
> > field. Now you just need to call this function with PersistenceManager as
> > argument.
>
> > public Torneo devolverTorneo(Long idTorneo) {
>
> > Torneo b = pm.getObjectById(Torneo.class, idTorneo);
>
> > b.detachFields(pm);
> > b=pm.detachCopy(b);
> > pm.close();
>
> > return b;
> > //The method return the object for update
>
> > }
>
> > public class Torneo implements Serializable{
> >
>
> > public void detachFields(PersistenceManager pm) {
>
> > pm.detachCopyAll(equiposTorneo);
>
> > }
>
> >
> > }
>
> > --
> > Prashant
> >www.claymus.com
>
> > --
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> > "Google App Engine for Java" group.
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>
>
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[appengine-java] Re: Problem persist JDO- one to many
It's only required for bidirectional mapping but he has a Torneo in the Equipo, i assumed it was bidirectional by reading that... but i could have been biased in the assumption... I found all the info here useful... but i think the DOCS should be updated. I know all this info ALREADY IS in the docs at http://code.google.com/appengine/docs/java/datastore/relationships.html#Owned_One_to_One_Relationships but since there's a little doubt it should be repeated in http://code.google.com/appengine/docs/java/datastore/relationships.html#Owned_One_to_Many_Relationships On Jul 13, 12:17 am, Prashant wrote: > Yes, it worked without explicitly detaching fields with just > defaultFetchGroup > set to "true". > > btw, > mappedBy property is required only for bi-directional mapping. > > -- > Prashantwww.claymus.com -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Problem persist JDO- one to many
you need to create a new method in Torneo which will detach collections
field. Now you just need to call this function with PersistenceManager as
argument.
public Torneo devolverTorneo(Long idTorneo) {
Torneo b = pm.getObjectById(Torneo.class, idTorneo);
b.detachFields(pm);
b=pm.detachCopy(b);
pm.close();
return b;
//The method return the object for update
}
public class Torneo implements Serializable{
public void detachFields(PersistenceManager pm) {
pm.detachCopyAll(equiposTorneo);
}
}
--
Prashant
www.claymus.com
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Re: [appengine-java] Re: Problem persist JDO- one to many
Hi Lisan,
In the Torneo class, i am not seeing "mappedBy" attribute for @persistent
tage for field
private List equiposTorneo;
That is required to make this a owned one-many collection. Only then it
might be possible to get collection of Equipo when retrieving Torneo .
Thanks
Hari
2010/7/12 Prashant
> you need to create a new method in Torneo which will detach collections
> field. Now you just need to call this function with PersistenceManager as
> argument.
>
> public Torneo devolverTorneo(Long idTorneo) {
>
> Torneo b = pm.getObjectById(Torneo.class, idTorneo);
>
>b.detachFields(pm);
>b=pm.detachCopy(b);
>pm.close();
>
> return b;
> //The method return the object for update
>
> }
>
>
> public class Torneo implements Serializable{
>
>
> public void detachFields(PersistenceManager pm) {
>
> pm.detachCopyAll(equiposTorneo);
>
> }
>
>
> }
>
> --
> Prashant
> www.claymus.com
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google App Engine for Java" group.
> To post to this group, send email to
> google-appengine-j...@googlegroups.com.
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> .
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> http://groups.google.com/group/google-appengine-java?hl=en.
>
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Re: [appengine-java] Re: Problem persist JDO- one to many
Yes, it worked without explicitly detaching fields with just defaultFetchGroup set to "true". btw, mappedBy property is required only for bi-directional mapping. -- Prashant www.claymus.com -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
