list Groovy/Grails：如何按 id 对对象列表进行排序
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Groovy/Grails : How to sort the list of objects by id
提问by monda
PublicTraining Class
公共培训班
class PublicTraining{
static hasMany = [trainingOrder: TrainingOrder]
}
and TrainingOrder Class
和 TrainingOrder 类
class TrainingOrder {
Date createdOn
static mapping = {
sort id:"asc"
}
}
if i want to get all the orders for training
如果我想获得所有培训订单
def orders = publicTrainingInstance.trainingOrder.sort()
println orders // [59,58] (id of orders)
which does not give sorted orders
不提供排序顺序
回答by Igor Artamonov
Default sort()is useful for Comparableobject. If your class is not a Comparable, use:
默认值sort()对Comparable对象很有用。如果您的课程不是Comparable，请使用：
def orders = publicTrainingInstance.trainingOrder.sort { it.id }
That code will sort by using passed id.
该代码将使用传递的 id 进行排序。
See docs: http://groovy.codehaus.org/groovy-jdk/java/util/Collection.html#sort()
请参阅文档：http: //groovy.codehaus.org/groovy-jdk/java/util/Collection.html#sort()
