I am using the latest version 1.1.0.M1
Please have a look and let me know
Karan
On Fri, Jul 1, 2011 at 2:29 AM, Michael Hunger <
michael.hun...@neotechnology.com> wrote:
> Neo4j is not implementing storing and traversing memory only structures. So
> it would be really advisable to do that in your domain layer only.
>
> I'll look into the elements returning null. I thought I already solved that
> some time ago. Which version of SDG are you using?
>
> Cheers
>
> Michael
>
> Am 30.06.2011 um 15:00 schrieb V:
>
> Any suggestions on this please ?
> It is really acting as a blocker for me. I have tried multiple
> alternatives, but I come up with one issue or the other.
>
>
> On Wed, Jun 22, 2011 at 8:51 PM, V <vlin...@gmail.com> wrote:
>
>> I am confused, elements is defined as
>>
>> @RelatedTo(type = "ELEMENT", elementClass = Element.class, direction =
>> OUTGOING)
>> private Set<Element> elements;
>>
>> if I call getElements() without persisting the node first, will it not
>> return null ?
>>
>> It is throwing null pointer exception.
>>
>> When I persist the node before calling getElements, then it returns empty
>> set. This is in line with my original email.
>>
>> Do you want me to do something else? Please let me know
>>
>>
>>
>>
>> On Wed, Jun 22, 2011 at 8:39 PM, Michael Hunger <
>> michael.hun...@neotechnology.com> wrote:
>>
>>> getElements() returns a set of your elements. If you do an add(element)
>>> on those then you build up an in-memory structure.
>>>
>>> So if you use just the getters and setters of your instances you can
>>> navigate this structure, but you can't use any of the graph operations
>>> supplied by neo4j (remember it is still just in memory)
>>>
>>> Cheers
>>>
>>> Michael
>>>
>>> Am 22.06.2011 um 17:06 schrieb V:
>>>
>>> Michael -
>>>
>>> In my quest for a cleaner solution , I am coming back to your original
>>> reply
>>>
>>> What do you mean by *"Right now this works only with the
>>> getElements().add method."*
>>> Please elaborate .
>>>
>>> Thanks for your help .
>>>
>>>
>>> On Sun, Jun 19, 2011 at 2:34 AM, Michael Hunger <
>>> michael.hun...@neotechnology.com> wrote:
>>>
>>>> Right now this works only with the getElements().add method.
>>>>
>>>> But then you don't get all the graph methods (traversals and such).
>>>>
>>>> We discussed some time ago writing a virtual graph layer on top of the
>>>> real nodes and relationships for SDG.
>>>> (That should be then used to have a simpler handling of
>>>> attached/detached nodes and keeping back-references for
>>>> cluster-persistance).
>>>>
>>>>
>>>> But that hasn't happend yet and I'm not convinced it will make it in the
>>>> 1.1. timeframe.
>>>>
>>>> Cheers
>>>>
>>>> Michael
>>>>
>>>> P.S. You can still persist your graph and remove the nodes later (either
>>>> index them on a "transient" index or keep their node-id's somewhere).
>>>>
>>>>
>>>> Am 18.06.2011 um 03:40 schrieb V:
>>>>
>>>> Any suggestions on this please ?
>>>>
>>>>
>>>> On Fri, Jun 17, 2011 at 11:03 PM, V <vlin...@gmail.com> wrote:
>>>>
>>>>> I created a graph model with 2 classes Node and Element as follows:
>>>>>
>>>>> public class Node {
>>>>>
>>>>> @RelatedTo(type = "ELEMENT", elementClass = Element.class, direction =
>>>>> OUTGOING)
>>>>> private Set<Element> Element;
>>>>>
>>>>>
>>>>> public void addElement(Element e) {
>>>>> relateTo(e, Relationships.ELEMENT.toString());
>>>>> }
>>>>>
>>>>> }
>>>>>
>>>>> public class Element{
>>>>>
>>>>> public String name;
>>>>>
>>>>> }
>>>>> I want to create an in memory graph structure without persisting the
>>>>> nodes as follows :
>>>>>
>>>>> Node n = new Node();
>>>>> n.addElement(new Element());
>>>>>
>>>>> *However it throws an exception as the Node n has not been persisted
>>>>> so the call to relateTo(..) fails. *
>>>>>
>>>>> If instead I do
>>>>> n.persist()
>>>>> and then call addElement(..) it works fine as the aspect kicks in.
>>>>>
>>>>> Any workaround for this ? That is, is there a way I can still use the
>>>>> above style without persisting the Node object ?
>>>>>
>>>>>
>>>>> My application needs this as first I create a structure and persist it,
>>>>> and then I create another structure to pass around some values to the
>>>>> persisted structure when doing some computations.
>>>>>
>>>>> -Karan
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>
>
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