MongoDB 的多个 PredicateSpecification 与 JpaSpecificationExecutor 与 Micronuat 数据的动态组合

Question

如何使用 MongoDB 中的 JpaSpecificationExecutor 将所有 PredicateSpecification 或 QuerySpecification 附加到 Micronaut 数据？

谓词

public class DiscountSpecification {
    final static BeanIntrospection<Discount> introspection = BeanIntrospection.getIntrospection(Discount.class);
    static String[] discountProperty = introspection.getPropertyNames();

    public static PredicateSpecification<Discount> DiscountIdEquals(ObjectId DiscountId) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(discountProperty[0]), DiscountId);
    }

    public static PredicateSpecification<Discount> DiscountCodeEquals(String DiscountCode) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(discountProperty[1]), DiscountCode);
    }
}

现在根据条件我要追加所有谓词

@Introspected
public record QueryBuilderSpecification() {
    public static PredicateSpecification<Discount> QueryBuilder(DiscountFilterModel discountFilterModel){
        PredicateSpecification<Discount> predicateSpecification = null;

        if (discountFilterModel.getId() != null){
            predicateSpecification =  DiscountIdEquals(new ObjectId(discountFilterModel.getId()));
        }
        if (discountFilterModel.getDiscountCode() != null){
            predicateSpecification =  DiscountCodeEquals(discountFilterModel.getDiscountCode());
        }
        return predicateSpecification;
    }
}

上面的代码并没有为这两个条件附加。如果两者都存在，我不确定如何将两者结合起来。

Answer 1

基于代码PredicateSpecification you can and & or specifications together. As demonstrated in the Micronaut Data User Guide

Answer 2

应该可以使用DiscountIdEquals(...).and(DiscountCodeEquals(..))。

你的例子可以用 PredicateSpecification.ALL 作为初始状态，然后有：

predicateSpecification = predicateSpecification.and(DiscountIdEquals(...)).

测试应用程序中有一些示例： https://github.com/micronaut-projects/micronaut-data/blob/master/doc-examples/mongo-example-java/src/test/java/example/PersonRepositorySpec.java#L50

MongoDB 的多个 PredicateSpecification 与 JpaSpecificationExecutor 与 Micronuat 数据的动态组合

Dynamic combination of multiple PredicateSpecification with JpaSpecificationExecutor with Micronuat data for MongoDB

java

micronaut

micronaut-data