[appengine-java] Re: Sometimes arraylist stored in Datastore are not correctly retrieved
I have almost 0 experience I'm just reading to learn a bit. It seems rather ambitious to store an ArrayList? Maybe modifying your "tags" to be an array would be more successful. You could probably keep your g/setters and modify them slightly. Then you have to convert exiting datastores. I don't know. I'll be interested to see what you discover either way. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/NwXCHDp2WZIJ. To post to this group, send email to google-appengine-java@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: Sometimes arraylist stored in Datastore are not correctly retrieved
Hi,
My declarations are a bit different but I have seen this
happening
GAE not loading the subitems by default in some cases, then if you
close the PersistenceManager, subitems List is null.
I have solved it by looping all items and subitems before closing the
PersistenceManager
On Jun 9, 4:05 am, cghersi wrote:
> Hi all,
>
> I've got an issue with a property with type ArrayList.
>
> Let's suppose I've got a class like this:
>
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> @Inheritance(strategy=InheritanceStrategy.SUBCLASS_TABLE)
> public class CommContact implements Serializable {
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> protected Long idCont;
>
> @Persistent(defaultFetchGroup="true")
> protected ArrayList tags;
>
> // other properties
>
> }
>
> And another class DBContact that extends CommContact, like this:
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> public class DBContact extends CommContact {
> // some other properties...
>
> }
>
> Now, let's suppose that I do a query on datastore and I retrieve a
> DBContact object. Sometimes (I cannot understand which is the pattern
> for this issue...) the property "tags" is not correctly valued,
> resulting in an empty array (but if I go to the DataViewer, I can
> actually see that on the datastore some tags exist for this DBContact
> object...).
>
> What am I missing?
>
> I really cannot understand why sometimes it works and sometimes not...
>
> Thank you very much!
>
> Bye
> cghersi
--
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-java@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: Sometimes arraylist stored in Datastore are not correctly retrieved
@Nathan: I use ArrayList for a bounch of other properties in several other objects, and usually they are completely OK... On 10 Giu, 05:31, Nathan Stiles wrote: > I have almost 0 experience I'm just reading to learn a bit. It seems rather > ambitious to store an ArrayList? Maybe modifying your "tags" to be an array > would be more successful. You could probably keep your g/setters and modify > them slightly. Then you have to convert exiting datastores. I don't know. > I'll be interested to see what you discover either way. -- 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-java@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: Sometimes arraylist stored in Datastore are not correctly retrieved
OK, thanks, I'll try with this trick...
Bye cghersi
On 10 Giu, 06:22, yuvi wrote:
> Hi,
>
> My declarations are a bit different but I have seen this
> happening
>
> GAE not loading the subitems by default in some cases, then if you
> close the PersistenceManager, subitems List is null.
> I have solved it by looping all items and subitems before closing the
> PersistenceManager
>
> On Jun 9, 4:05 am, cghersi wrote:
>
>
>
>
>
>
>
> > Hi all,
>
> > I've got an issue with a property with type ArrayList.
>
> > Let's suppose I've got a class like this:
>
> > @PersistenceCapable(identityType = IdentityType.APPLICATION,
> > detachable = "true")
> > @Inheritance(strategy=InheritanceStrategy.SUBCLASS_TABLE)
> > public class CommContact implements Serializable {
> > @PrimaryKey
> > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > protected Long idCont;
>
> > @Persistent(defaultFetchGroup="true")
> > protected ArrayList tags;
>
> > // other properties
>
> > }
>
> > And another class DBContact that extends CommContact, like this:
> > @PersistenceCapable(identityType = IdentityType.APPLICATION,
> > detachable = "true")
> > public class DBContact extends CommContact {
> > // some other properties...
>
> > }
>
> > Now, let's suppose that I do a query on datastore and I retrieve a
> > DBContact object. Sometimes (I cannot understand which is the pattern
> > for this issue...) the property "tags" is not correctly valued,
> > resulting in an empty array (but if I go to the DataViewer, I can
> > actually see that on the datastore some tags exist for this DBContact
> > object...).
>
> > What am I missing?
>
> > I really cannot understand why sometimes it works and sometimes not...
>
> > Thank you very much!
>
> > Bye
> > cghersi
--
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-java@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: Sometimes arraylist stored in Datastore are not correctly retrieved
That's really cool and flexible. I'm quite impressed. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/OYvt6ELYLVUJ. To post to this group, send email to google-appengine-java@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.
