QueryDSL to get any entities in a collection of another entity

问题

I'm using JPA with Hibernate and QueryDSL (v.4.0.5). I have this entity:

package com.test.model.entity;

@Entity
public class Article {
    @Id
    private Long id;

    @ManyToMany(fetch = LAZY, cascade = DETACH)
    private Set<Tag> tags;
}

How can I find all the articles matching a given set of Tags? I think I should start as follows:

public BooleanExpression hasTag(Set<Tag> tags){
    final QArticle article = QArticle.article;
    return article.tags.any().eqAny(ce);
}

where ce should be a CollectionExpression. Clearly I have no idea how to set this.

Any solution?

回答1:

Did you try

public BooleanExpression hasTag(Set<Tag> tags){
    QArticle article = QArticle.article;
    return article.tags.any().in(tags);
}

来源：https://stackoverflow.com/questions/33445572/querydsl-to-get-any-entities-in-a-collection-of-another-entity