how to implement specification in java spring boot

Chamrong Thor answered on September 4, 2022 Popularity 5/10 Helpfulness 1/10

answer how to implement specification in java spring boot

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how to implement specification in java spring boot

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public final class RestaurantSpecifications {

    private RestaurantSpecifications() {
    }

    public static Specification<Restaurant> hasTopRating() {
        return new RestaurantTopRatedSpecification();
    }
}

Popularity 5/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

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Contributed on Sep 04 2022

Chamrong Thor

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class RestaurantNameSpecification implements Specification<Restaurant> {

    private final String name;

    public RestaurantNameSpecification(String name) {
        this.name = name;
    }

    @Override
    public Predicate toPredicate(Root<Restaurant> restaurant, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        final var nameExpression = criteriaBuilder.lower(restaurant.get(Restaurant_.name));
        return criteriaBuilder.like(nameExpression, "%" + name.toLowerCase() + "%");
    }
}

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Source: jschmitz.dev

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Chamrong Thor

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how to implement specification in java spring boot

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<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-jpamodelgen</artifactId>
</dependency>

Popularity 7/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

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Chamrong Thor

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how to implement specification in java spring boot

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public interface RestaurantRepository extends JpaRepository<Restaurant, Long>,
                                              JpaSpecificationExecutor<Restaurant> {
    // old query methods omitted for brevity
}

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Source: jschmitz.dev

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Contributed on Sep 04 2022

Chamrong Thor

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how to implement specification in java spring boot

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class RestaurantTopRatedSpecification implements Specification<Restaurant> {

    public static final double MINIMAL_AVERAGE_RATING = 8.0;

    @Override
    public Predicate toPredicate(Root<Restaurant> restaurant, 
                                 CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        final var averageRating = criteriaBuilder.avg(restaurant.join(Restaurant_.RATINGS).get(Rating_.SCORE));
        final var topRatedPredicate = criteriaBuilder.greaterThanOrEqualTo(averageRating, MINIMAL_AVERAGE_RATING);
        query.groupBy(restaurant.get(Restaurant_.ID)).having(topRatedPredicate);

        return null;
    }
}

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Source: jschmitz.dev

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Contributed on Sep 04 2022

Chamrong Thor

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how to implement specification in java spring boot

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@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    // constructor ommited for brevity

    public List<Restaurant> findTopRated() {
        return restaurantRepository.findAll(where(hasTopRating()));
    }
}

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Source: jschmitz.dev

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Chamrong Thor

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how to implement specification in java spring boot

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@DataJpaTest
class RestaurantNameSpecificationTest {

    @Autowired
    private RestaurantRepository restaurantRepository;

    @BeforeEach
    void setup() {
        restaurantRepository.save(new Restaurant("Café Java"));
        restaurantRepository.save(new Restaurant("Spring Restaurant"));
        restaurantRepository.save(new Restaurant("Jakarta Restaurant"));
    }

    @Test
    void matchesName() {
        final var topRestaurants = restaurantRepository.findAll(
                where(nameIsLike("Restaurant"))
        );

        assertThat(topRestaurants, hasSize(2));
        assertThat(topRestaurants, contains(
                hasProperty("name", is("Spring Restaurant")),
                hasProperty("name", is("Jakarta Restaurant"))
        ));
    }
}

Popularity 5/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: spring-boot java

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Contributed on Sep 04 2022

Chamrong Thor

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how to implement specification in java spring boot

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