grails - 此树结构的理想Grails类域是什么

Question

我正在开发一个需要带有子类别的类别的网站。

我当前的域类是:

package com.abc

class Category {

    String title
    String description
    Category parent

    static hasMany = [children: Category, listing: Listing]

    static constraints = {
        title blank: false
        description blank: true
    } 
}

但这给了我一个错误:

Property [children] in class [class com.abc.Category] is a bidirectional one-to-many with two possible properties on the inverse side. Either name one of the properties on other side of the relationship [category] or use the 'mappedBy' static to define the property that the relationship is mapped with. Example: static mappedBy = [children:'myprop']

Answer 1

我只会使用Category parent。我们总是可以通过Category.findAllByParent来生 child 。这也是以后在树创建中使用的最简单的解决方案。