grails - 如何按给定日期/编号顺序保存addTo？

Question

我需要一些有关API的帮助，当我在网络上时，订单保存正确，但是在API上时，一切都会出错:

def test = parseJSON.sort { a, b -> a.ID <=> b.ID } //or dateTime, will print the same
//order when I print each of them
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:1, ID:1, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:0, ID:2, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:0, ID:3, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:4, ID:4, ph:0, redoxPotential:0, temperature:0]

    test.each{
        def sample = new SampleWater()
        sample.levelWater = it.levelWater
        sample.conductivity = it.conductivity
        sample.dissolvedOxygen = it.dissolvedOxygen
        sample.redoxPotential = it.redoxPotential
        sample.ph = it.ph
        sample.temperature = it.temperature
        water.addToSamples(sample)
    }
    return water

我的问题是 addTo没有按顺序保存。我该如何解决？

Answer 1

确保已在List域类中将样本类型定义为Water，以便我们可以维护插入顺序:

class Water {

    static hasMany = [samples: Sample]

    List<Sample> samples = []
}

class Sample {

    def levelWater
}

默认情况下， hasMany的实现为 Set类型，它不维护插入顺序，但负责唯一性。

从那时起，现在您的样本将按照插入时的顺序保存。