Grails 清除 hasMany 条目并添加新条目错误？

Question

我目前正在处理 grails 应用程序，并且我有一个附加到帐户的地址列表。基本上我想要做的是在编辑帐户时显示所有附加地址的当前列表，然后我可以从 View 中删除/添加任意数量的地址。当这个数据被捕获时，它被 Controller 拾取，我想要做的是能够从这个帐户中清除所有当前地址，然后使用 View 中存在的内容再次创建列表，我的代码如下:

账户域:

class Account {

    String name
    Date dateCreated
    Date lastUpdated

    static hasMany = [addresses:Addresses]

    static mapping = {
        addresses cascade:"all-delete-orphan"
    }

    def getAddressesList() {
        return LazyList.decorate(
              addresses,
              FactoryUtils.instantiateFactory(Addresses.class))
    }

    static constraints = {
        name(blank:false, unique: true)
    }

}

地址域:

class Addresses {

    int indexVal
    String firstLine
    String postcode
    String area

    static belongsTo = [account:Account]

    static mapping = {
    }

    static transients = [ 'deleted' ]

    static constraints = {
        indexVal(blank:false, min:0)
    }


}

账户管理员:

def update() {

    def accountInstance = Account.get(params.id)
    if (!accountInstance) {
        flash.message = message(code: 'default.not.found.message', args: [message(code: 'account.label', default: 'Account'), params.id])
        redirect(action: "list")
        return
    }

    if (params.version) {
        def version = params.version.toLong()
        if (accountInstance.version > version) {
            accountInstance.errors.rejectValue("version", "default.optimistic.locking.failure",
                      [message(code: 'subscriptions.label', default: 'Subscriptions')] as Object[],
                      "Another user has updated this Account while you were editing")
            render(view: "edit", model: [accountInstance: accountInstance])
            return
        }
    }

    accountInstance.properties = params

    accountInstance.addresses.clear()
    accountInstance.save(flush: true)

    ....

}

错误:

A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: com.tool.Account.addresses. Stacktrace follows:
Message: A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: com.tool.Account.addresses

此错误似乎发生在在线 Controller 中:

accountInstance.save(flush: true)

我已经尝试了几种不同的方法来让它工作，并且非常感谢一些帮助。

Answer 1

因此，您似乎已经完成了一些 Grails 可以为您完成的工作。

class Account {

    String name
    Date dateCreated
    Date lastUpdated

    List addresses

    static hasMany = [addresses:Address]

    static mapping = {
        addresses cascade:"all-delete-orphan"
    }

    static constraints = {
        name(blank:false, unique: true)
    }

}

class Address {
    String firstLine
    String postcode
    String area

    static belongsTo = [account:Account]
}

这将产生您想要的地址作为列表的效果。

我找到了

instance.addresses = null

或者

instance.addresses.clear()

为我工作