Description
There is a PersonRepository and Person entity,
Person class contains List<Qualification>. Qualification class has 3 simple fields.
I have tried to add @Query annotation on custom method and use JPQL to get the results, but Qualification class fields were not available for manipulation in JPQL as it repository itself contains List<Qualification> instead of just a simple field of Qualification.
How can I search by these Qualification's nested fields?
Query
Now I need to find list of person entity where qualification's experienceInMonths is greater than 3 and less than 9 AND qualification's name field = 'java'.
Code
Person.java
@Data
@Entity
public class Person {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private String id;
@NotEmpty
@Size(min = 2)
private String name;
@NotEmpty
@Size(min = 2)
private String surname;
@ElementCollection(targetClass = java.util.ArrayList.class, fetch = FetchType.EAGER)
private List<Qualification> qualifications = new ArrayList<>();
}
PersonRepository.java
@Repository
public interface PersonRepository extends JpaRepository<Person, String> {
}
Qualification.java
@Data
@AllArgsConstructor
public class Qualification implements Serializable {
@Id @GeneratedValue
private String id;
private String name;
private String experienceInMonths;
}
EDIT: not duplicate of this post, as here is the collection of nested objects. Not just single reference.
First, change experienceInMonths from String to int (otherwise you can not compare the string with the number). Then you can try to use this 'sausage':
List<Person> findByQualifications_experienceInMonthsGreaterThanAndQualifications_experienceInMonthsLessThanAndName(int experienceGreater, int experienceLess, String name);
Or you can try to use this pretty nice method:
@Query("select p from Person p left join p.qualifications q where q.experienceInMonths > ?1 and q.experienceInMonths < ?2 and q.name = ?3")
List<Person> findByQualification(int experienceGreater, int experienceLess, String name);