如何在 Grails 中对域类中的关系施加约束？
我有一个像这样的域三域类：
Tasks.groovy
class Tasks {
static belongsTo = [ user : User ]
//other fields
Date startDate
Date endDate
}
User.groovy
class User {
//relationships. . . .
static belongsTo = [ company : Company, role : Role, resource : Resource]
static hasMany = [ holidays : Holiday, tasks : Tasks]
//other fields
}
Holiday.groovy
class Holiday {
static belongsTo = User
Date startDate
Date endDate
//other fields
}
现在，当我创建一个 Tasks< /code> 实例，我想设置一个约束，使 Tasks startDate 和 endDate 不属于 User< /代码>的假期的startDate和endDate。如果有则抛出并出错。
我想要一种方法来将此约束施加在我的域类本身上（即在 Tasks 上）。
可以这样做吗？
提前致谢。
I have a domain three domain class like this :
Tasks.groovy
class Tasks {
static belongsTo = [ user : User ]
//other fields
Date startDate
Date endDate
}
User.groovy
class User {
//relationships. . . .
static belongsTo = [ company : Company, role : Role, resource : Resource]
static hasMany = [ holidays : Holiday, tasks : Tasks]
//other fields
}
Holiday.groovy
class Holiday {
static belongsTo = User
Date startDate
Date endDate
//other fields
}
Now when I create a Tasks instance, I want to put a constraint such that the Tasks startDate and endDate doesn't fall within the User's Holidays startDate and endDate. And throw and error if it has.
I want a way to put this constraint on my domain class itself(i.e on Tasks).
Is it possible to do so?
Thanks in advance.
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您可以使用自定义验证器来完成此操作。
您可以将自定义验证逻辑封装为闭包。您还必须为 endDate 添加类似的逻辑。
You can accomplish this using a custom validator.
You can encapsulate your custom validation logic as a closure. You will have to add similar logic for endDate as well.
我会在用户域中使用 createTask 函数，因为任务不应该摆弄迄今为止已删除的变量（self -> User -> Holiday -> startDate）。
很明显，用户知道假期何时开始和结束，因此可以轻松验证新任务的给定开始和结束日期。
I would go with having a
createTaskfunction in the User domain, since Task should not be fiddling with variables that are so far removed (self -> User -> Holiday -> startDate).It is quite clear that the User knows when its holiday starts and ends and thus would easily validate the given start and end dates for a new Task.