ios - 保存时给出的 Realm 错误

Question

我有一个像这样填充的数据库:

for defJson in listofDefinitions {
    let newItemOfStock = Item()
    print(defJson)
    try! realm.write {
        newItemOfStock.AverageCost = defJson["AverageCost"] as! Int
        newItemOfStock.Barcode = defJson["Barcode"] as! String
        newItemOfStock.Description = defJson["Description"] as! String
        newItemOfStock.InternalUnique = defJson["InternalUnique"] as! Int
        newItemOfStock.LastCost = defJson["LastCost"] as! Int
        newItemOfStock.LimitToMainRegionUnique = defJson["LimitToMainRegionUnique"] as! Int
        newItemOfStock.Notes = defJson["Notes"] as! String
        newItemOfStock.StockCategoryUnique = defJson["StockCategoryUnique"] as! Int
        newItemOfStock.StockCode = defJson["StockCode"] as! String
        newItemOfStock.StockGroupUnique = defJson["StockGroupUnique"] as! Int
        newItemOfStock.UnitDescriptor = defJson["UnitDescriptor"] as! String

        self.newList.listOfItems.append(newItemOfStock)
    }
}

但在我填充数据之前，我想删除仍然在 Realm 数据库中的旧数据，我称之为 func:

func cleanOldData() {
    let itemListToBeRemoved = realm.objects(ListOfDefinitions)
    let itemToBeRemoved = realm.objects(Item)
    try! realm.write {
        realm.delete(itemListToBeRemoved)
        realm.delete(itemToBeRemoved)
    }
}

但是如果我多次调用这个方法就会抛出这个错误:

'RLMException', reason: 'Adding a deleted or invalidated object to a Realm is not permitted'

我如何阻止这种情况发生并在填充之前仍然有一个干净的数据库

Answer 1

如果你真的想从你的 Realm 中删除所有数据(而不仅仅是特定类型的数据)，你可以尝试使用 deleteAll() API:

try! realm.write {
  realm.deleteAll()
}