Nested query in JPQL - sql

Question

I have 2 entities -
#Table(name = "MM_MONITORING_CARD")
#Entity(name = "mm_MonitoringCard")
public class MonitoringCard extends StandardEntity {
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "CLIENT_ID")
private Counterparty client;
#Column(name = "START_DATE")
private LocalDate startDate;
#Column(name = "END_DATE")
private LocalDate endDate;
...otherColumn
}
and
#DiscriminatorColumn(name = "TYPE", discriminatorType = DiscriminatorType.STRING)
#Table(name = "MM_COUNTERPARTY")
#Entity(name = "mm_Counterparty")
#DiscriminatorValue("COUNTERPARTY")
#NamePattern("%s|name")
public class Counterparty extends StandardEntity {
#Column(name = "TYPE", insertable=false, updateable=false)
private String type;
...otherColumn
I need get all examples monitoringCard with condition - 1) between start date and end date 2) with Counterparty type = 'someType'
I do method -
List<MonitoringCard> monitoringCardList = dataManager.load(MonitoringCard.class)
.query("select distinct cm from mm_MonitoringCard m join mm_Counterparty cm where (m.current_date between cm.startDate and cm.endDate) and cm.type = :type")
.parameter("type", "someType")
.list();
but i get error, how can i make a correct request?
thanks

Answer 1

Your query is not correct. It should use a join like this:
select distinct m.Counterparty from mm_MonitoringCard m
where (m.current_date between m.Counterparty.startDate and m.Counterparty.endDate)
and m.Counterparty.type = :type
In JPA you don't need to do an explicit join when navigating on a ToOne relationship.