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POcan't save @RelationshipEntity
 

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  1. POcan't save @RelationshipEntity
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    <p>I'm try to save some @RelationshipEntity: I've questionnaires, each of them related to some questions. First I tried like follow:</p> <pre><code>@RelatedToVia private Set&lt;HasQuestionRelationship&gt; question = new HashSet&lt;HasQuestionRelationship(); </code></pre> <p>and save just the root. That brings me to this problem: <a href="http://forum.springsource.org/showthread.php?124316-Spring-Data-Neo4j-NullPointerException-with-RelatedToVia" rel="nofollow">http://forum.springsource.org/showthread.php?124316-Spring-Data-Neo4j-NullPointerException-with-RelatedToVia</a> and this open issue <a href="https://jira.springsource.org/browse/DATAGRAPH-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel#issue-tabs" rel="nofollow">https://jira.springsource.org/browse/DATAGRAPH-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel#issue-tabs</a></p> <p>then i tried to save just one relation:</p> <pre><code>@RelatedToVia(elementClass=HasQuestionRelationship.class, type="HAS_QUESTION", direction=Direction.OUTGOING) private HasQuestionRelationship question2; </code></pre> <p>my relation class looks like:</p> <pre><code>@RelationshipEntity(type="HAS_QUESTION") public class HasQuestionRelationship { @GraphId Long id; private String name; @StartNode private QuestionnaireNode questionnaire; @EndNode private QuestionNode question; public HasQuestionRelationship() { } public HasQuestionRelationship(QuestionnaireNode questionnaireNode, QuestionNode question, String string) { if (question == null) System.out.println("csxa"); this.questionnaire = questionnaireNode; this.question = question; this.name = string; } public String getName() { return name; } public void setName(String name) { this.name = name; } public QuestionnaireNode getQuestionnaire() { return questionnaire; } public void setQuestionnaire(QuestionnaireNode questionnaire) { this.questionnaire = questionnaire; } public QuestionNode getQuestion() { return question; } public void setQuestion(QuestionNode question) { this.question = question; } } </code></pre> <p>my class questionnaire looks like this:</p> <pre><code>public class QuestionnaireNode extends BaseNode { @RelatedToVia(elementClass=HasQuestionRelationship.class, type="HAS_QUESTION", direction=Direction.OUTGOING) private HasQuestionRelationship question2; public QuestionnaireNode() {} public QuestionnaireNode(String name) { setName(name); } public QuestionnaireNode(String name, QuestionNode question) { setName(name); this.question2 = new HasQuestionRelationship(this, question, "testrelation"); } public HasQuestionRelationship getQuestion2() { return question2; } public void setQuestion(HasQuestionRelationship question) { this.question2 = question; } } </code></pre> <p>Now, I tried to save some testdata:</p> <pre><code> QuestionNode question = new TextQuestionNode("question"); QuestionnaireNode questionnaire = new QuestionnaireNode("questionnaire"); HasQuestionRelationship relationtype = new HasQuestionRelationship(questionnaire, question, "mytest"); questionnaire.setQuestion(relationtype); try { myRepository.save(question); myRepository.save(questionnaire); } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>No exception is thrown. Im happy, but if i look into my database, i see just 2 nodes, but no relationship between them. Where is my fault?</p> <p>Thanks</p>
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    1. UShilbert
    1. UShilbert
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      1. POcan't save @RelationshipEntity
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      1. VTUpMod
    1. COWhat version of SDN are you using? We added the handling of single @RelatedToVia fields only recently. Please either update to 2.1.M1 or use an Set<HasQuestionRelationship> as a workaround meanwhile. (https://jira.springsource.org/browse/DATAGRAPH-182)
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      1. USMichael Hunger
    2. COah ok, i'll try this at after this weekand ^^, thanks for the answer
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      1. UShilbert
    3. COwow, thanks a lot, that works!
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      1. UShilbert
 

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