更新时间:2023-10-27 10:45:10
您可以使用 Pack.read(id)
来获得
处于只读状态的指定标识的域类实例。如果具有指定id的行不存在,则返回null。
请参阅 http://grails.org/doc/latest/ref/Domain%20Classes/read.html
I'm using Grails and I have the following domain class:
class Pack {
String code
Date publishedDate
//several other properties (including collections hasMany)....
def isPublished() {
return publishedDate != null
}
def publish() {
publishedDate = new Date()
}
def canEdit() {
return !isPublished()
}
}
To sell a Pack I first need publish it and I use the publish method to publicate a Pack.
After published, a Pack cannot be changed (i.e. after published, a Pack need to be a immutable instance).
My question is:
or
Another option is to use the canEdit() method combined with the Hibernate events (beforeUpdate and beforeDelete). If canEdit() == false then I can throw a RuntimeException inside the beforeDelete or beforeUpdate. Is a good solution?
Obs.: I think that the freeze method in Ruby does exactly what I need. (http://rubylearning.com/satishtalim/mutable_and_immutable_objects.html)
you can use Pack.read( id )
to get
an instance of the domain class for the specified id in a read-only state. null is returned if the row with the specified id doesn't exist.
see http://grails.org/doc/latest/ref/Domain%20Classes/read.html