JPA repository property expression

问题

In my Spring Boot application (based on JHipster 4) I am trying to use property expressions to filter my query by attributes of related entities as described in the Spring docs: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-property-expressions

I want to get all Appointments, with a certain EmployeeAccount in their AppointmentSchedules but only receive an empty list.

@Repository
public interface AppointmentRepository extends JpaRepository<Appointment, Long> {

        public List<Appointment> findByScheduledAppointmentsEmployeeAccountsId(Long id);
}

the relevant entities and their relationships:

@Entity
@Table(name = "appointment")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Appointment implements Serializable {

    @OneToMany(mappedBy = "appointments")
    @JsonIgnore
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    private Set<AppointmentSchedule> scheduledAppointments = new HashSet<>();

...

}

@Entity
@Table(name = "appointment_schedule")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class AppointmentSchedule implements Serializable {

    @ManyToMany
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @JoinTable(name = "appointment_schedule_employee_accounts", joinColumns = @JoinColumn(name = "appointment_schedules_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "employee_accounts_id", referencedColumnName = "id"))
    private Set<EmployeeAccount> employeeAccounts = new HashSet<>();

...

}

@Entity
@Table(name = "employee_account")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class EmployeeAccount implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
    @SequenceGenerator(name = "sequenceGenerator")
    private Long id;

...

}

The hibernate console output when executong the query:

Hibernate: select appointmen0_.id as id1_1_, appointmen0_.institution_id as institut2_1_, appointmen0_.user_account_id as user_acc3_1_ from appointment appointmen0_ where appointmen0_.user_account_id=?

I would much appreciate if someone could tell me what I'm doing wrong here.

Edit: Please note that the Appointment table doesn't contain a column for the AppointmentSchedules as it's a OneToMany relationship. Maybe that's the reason? I thought JPA would handle that logic for me...

The table structure:

APPOINTMENT;
ID      ...

APPOINTMENT_SCHEDULE;
ID      APPOINTMENTS_ID    ...

APPOINTMENT_SCHEDULE_EMPLOYEE_ACCOUNTS;
EMPLOYEE_ACCOUNTS_ID    APPOINTMENT_SCHEDULES_ID

EMPLOYEE_ACCOUNT;
ID    ...

EDIT 2: I was able to resolve the issue. It was a classical PEBCAK error because I accidentally called a similarly named method in my service class facepalm. Thanks a lot to everyone who helped me! Both Gaurav Srivastav's and Dean's answers work but are not neccessary, as the original code from the question already works

回答1:

You must use an underscore before referencing the nested fields. Try:

public List<Appointment> findByScheduledAppointments_EmployeeAccounts_Id(Long id)

回答2:

Yes add the word In to your method and provide Set<Long> as employeeAccountIds.

Set<Person> findByScheduledAppointmentsEmployeeAccountsIdIn(Set<Long> employeeIds);

来源：https://stackoverflow.com/questions/51080713/jpa-repository-property-expression

标签

java

spring-boot

spring-data-jpa