问题描述
我有一个自定义类 Invoice
,其中包含一组自定义类 InvoiceItems。
当我删除 Invoice
时,我想删除与其关联的所有记录。目前,当我删除 Invoice
时,发票项目仍列在数据库中。
我认为当您删除父记录时,它应该删除嵌套项,因为我使用的是数组而不是关系或指针。
func removeInvoice(with invoice: Invoice,completion: @escaping (Result<Bool,NSError>) -> ()) {
guard let invoiceObjectId = invoice.getPFInvoice()?.objectId else {
let error = NSError(domain: "OURTEAM",code: 0,userInfo: [NSLocalizedDescriptionKey: "Remove invoice failure"])
completion(.failure(error))
return
}
let query = PFQuery(className: "Invoice")
query.whereKey("objectId",equalTo: invoiceObjectId)
query.findobjectsInBackground { (objects,error) in
if let unwrappedError = error as NSError? {
completion(.failure(unwrappedError))
}
if let unwrappedobjects = objects {
for object in unwrappedobjects {
object.deleteEventually()
}
completion(.success(true))
}
}
}
解决方法
您可以创建和 afterDelete 触发器来删除子项:
Parse.Cloud.afterDelete('Invoice',({ object }) => {
return Parse.Object.destroyAll(object.get('arrayField'));
});