Grails createCriteria group by(groupProperty 函数)多个属性

Question

我想知道 grails createCriteria 是否支持像纯 sql 那样按多个属性分组。我想列出这样的条目:

def criteria = DomainClass.createCriteria()
def results = criteria.list {
    groupProperty('parameterA')
    groupProperty('parameterB')
}

这将仅列出具有唯一参数 A 和参数 B 组合的条目。问题是这不起作用，是否有任何解决方案，或者我应该使用 hsql 或类似的东西吗？

谢谢，
马特奥

Answer 1

尝试进行预测，例如:

def criteria = DomainClass.createCriteria()
def results = criteria.list {
    projections{
        groupProperty('parameterA')
        groupProperty('parameterB')
    }
}

我写了一些测试

void test2xGroupProperty(){
    def pablo = new Artist(name: 'Pablo').save()
    def salvador = new Artist(name: 'Salvador').save()
    new Portrait(artist: pablo, name: "Les Demoiselles d'Avignon 1", value: 10.00).save()
    new Portrait(artist: pablo, name: "Les Demoiselles d'Avignon 2", value: 10.00).save()
    new Portrait(artist: pablo, name: "Les Demoiselles d'Avignon 3", value: 10.00).save()
    new Portrait(artist: salvador, name: "The Persistence of Memory 1", value: 20.00).save()
    new Portrait(artist: salvador, name: "The Persistence of Memory 2", value: 20.00).save()
    new Portrait(artist: salvador, name: "The Persistence of Memory 3", value: 20.00).save()
    def artistValue = Portrait.withCriteria{
        projections{
            groupProperty('value')
            groupProperty('artist')
        }
    }
    assert [[10.00, pablo], [20.00, salvador]] ==  artistValue
}

在此处查看更多示例:
https://github.com/fabiooshiro/plastic-criteria/blob/master/src/groovy/plastic/criteria/CriteriaDocTests.groovy