JPA Specification filtering nested object - spring-boot

Question

I am trying to fetch nested object property but getting illegalArgument exception.
AuditTestingPlanSpecification name = new AuditTestingPlanSpecification(new SearchCriteria("auditPlanId.auditPlanEntity", ":",dates));
Page<AuditTestingPlanMaster> a = auditTestingPlanMasterRepository.findAll(name, ten);
Please find below code,
public class AuditTestingPlanSpecification implements Specification<AuditTestingPlanMaster> {
private SearchCriteria criteria;
public AuditTestingPlanSpecification(SearchCriteria searchCriteria) {
this.criteria = searchCriteria;
}
#Override
public Predicate toPredicate(Root<AuditTestingPlanMaster> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
if (root.get(criteria.getKey()).getJavaType() == String.class) {
return builder.like(root.<String>get(criteria.getKey()), "%" + criteria.getValue().get(0).toString() + "%");
} else {
return builder.equal(root.get(criteria.getKey()), criteria.getValue().get(0).toString());
}
return null;
}
}
Class SearchCriteria.java
public class SearchCriteria {
public SearchCriteria(String key, String operation, List<Object> value) {
super();
this.key = key;
this.operation = operation;
this.value = value;
}
private String key;
private String operation;
private List<Object> value;
// getters & setters
}
Class AuditTestingPlanMaster.java
#Entity
#Table(name = "audit_testing_plan_master")
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class AuditTestingPlanMaster implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
#SequenceGenerator(name = "sequenceGenerator")
private Long id;
#Column(name = "risk_area_id")
private Long riskAreaId;
#Column(name = "expected_revert_date")
private Instant expectedRevertDate;
#Column(name = "created_date")
private Instant createdDate;
#Column(name = "last_modified_date")
private Instant lastModifiedDate;
#JoinColumn(name = "audit_plan_id", referencedColumnName = "id")
private AuditPlanMaster auditPlanId;
//getters & setters
}
Class AuditPlanMaster.java
#Entity
#Table(name = "audit_plan_master")
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class AuditPlanMaster implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
#SequenceGenerator(name = "sequenceGenerator")
private Long id;
#Column(name = "remarks", length = 255)
private String remarks;
#Column(name = "audit_plan_entity", length = 50)
private String auditPlanEntity;
#Column(name = "start_date")
private Instant startDate;
#Column(name = "end_date")
private Instant endDate;
//getters & setters
}
I want to fetch all the AuditTestingPlanMaster objects whose AuditPlanMaster.auditPlanEntity string is matching with provided filter value.
Thank you for your time and help in advance.

Answer 1

I had the same problem, here is a snippet of how I handled it. My problem was when accessing id field from inner usuario object, in my case, id would be like your auditPlanEntity, and usuario would be like auditplanMaster:
public static Specification<UsuarioErrorEquipo> usuarioContains(String codigoUsuario) {
return (root, query, builder) -> {
Path<Usuario> u = root.get("usuario");
return builder.equal(u.get("id"), codigoUsuario);
};
}
I believe, that in your case it should be something like:
Path<AuditPlanMaster> u = root.get("auditPlanId");
return builder.equal(u.get("auditPlanEntity"), "the value you want to compare");