Question

我试图通过SDN 4存储库方法为我的自定义Cyper查询引入Pageable支持：

@Query(value = "MATCH (parentD)-[:CONTAINS]->(childD:Decision)-[ru:CREATED_BY]->(u:User) WHERE id(parentD) = {decisionId} OPTIONAL MATCH (childD)<-[:VOTED_FOR]-(vg:VoteGroup)-[:VOTED_ON]->(c:Criterion) WHERE id(c) IN {criteriaIds} WITH childD, ru, u, vg.avgVotesWeight as weight RETURN childD AS decision, ru, u, sum(weight) as weight ORDER BY weight DESC", countQuery="MATCH (parentD)-[:CONTAINS]->(childD:Decision) WHERE id(parentD) = {decisionId} RETURN count(childD)")
Page<WeightedDecision> getChildDecisionsSortedBySumOfCriteriaAvgVotesWeight(@Param("decisionId") Long decisionId, @Param("criteriaIds") Set<Long> criteriaIds, Pageable pageable);

WeightedDecision是@QueryResult：

@QueryResult
public class WeightedDecision {

    private Decision decision;

    private double weight;

    public Decision getDecision() {
        return decision;
    }

    public void setDecision(Decision decision) {
        this.decision = decision;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

}

现在这个逻辑失败了ClassCastException例外：

java.lang.ClassCastException: com.example.domain.model.decision.result.WeightedDecision cannot be cast to org.springframework.data.domain.Page

我做错了什么以及如何解决？

Answer 1

SDN版本2.0.4不支持@QueryResult的分页。版本2.0.5 将支持此功能，并且该功能可用于快照构建存储库中的UAT。

Spring Data Neo4j 4和Pageable @QueryResult

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