從解析本地數據存儲區中刪除對象unpinAll不起作用

Question

因此，我正在向解析本地數據存儲中寫入一堆數據，但是想在我固定新表之前刪除舊表。 問題是它似乎並沒有被刪除，而我最終在同一張表中出現了多個條目。

這是將數據寫入本地數據存儲的代碼。

 class func buildHistoryPart(selectedPartId: String? = nil) {

        let query = PFQuery(className: "Part")
            query.includeKey("fromPack")

            query.findObjectsInBackground { (objects, error) in

            if error != nil {

                print(error!)

            } else if let parts = objects {

                for object in parts {

                    //if the objectID is equal to the id of the part received
                    if object.objectId == selectedPartId {

                        // if the fromPack column has data
                        if let fromPack = object.object(forKey: "fromPack") as? PFObject {

                            // create the class name from the pack name of the selected part
                            if let className = (fromPack.object(forKey: "packName") as? String) {

                                // creeate PFObject to rretrieved fields to
                                let historyClass = PFObject(className: className) as PFObject

                                    //add the objects to new class
                                    historyClass.add(object.objectId as Any, forKey: "partId")
                                    historyClass.add(object.object(forKey: "partName") as Any, forKey: "partName")
                                    historyClass.add(fromPack.object(forKey: "packName")!, forKey: "packName")
                                    historyClass.add(fromPack.objectId as Any, forKey: "packId")


                                        // unpin the old data
                                        PFObject.unpinAll(inBackground: [historyClass], withName: "pinnedHistory", block: { (success, error) in

                                            if success {

                                                // if successful pin the new data
                                                PFObject.pinAll(inBackground: [historyClass], withName: "pinnedHistory")
                                            }
                                        })
                            }
                        }

                    }
                }
            }
        }
    }

它不會取消固定，並且每次運行該函數時，我都會在LDS中得到一堆表。

-------------------編輯--------------------

我無法解決的問題是，我無法使用他們已記錄的“ withName”屬性來使parse函數正常工作，因此只能調用一個專門查詢所涉及表的函數，如果該表在那里刪除了該函數。 它可以正常工作，但是如果有人知道為什么我的原始代碼無法正常工作，那么id會很高興知道。

稱呼它代替上面的取消固定：

class BuildHistory {

// unpinall doesnt seem to wok so force it and return result
class func removeOldTable(className: String, completeBlock: @escaping (Bool) -> Void) {

    let queryRem = PFQuery(className: className)
        queryRem.fromLocalDatastore()
        queryRem.findObjectsInBackground { (objects, error) in

            if objects != nil {

                PFObject.unpinAll(inBackground: objects)

                completeBlock(true)

            }
        }
}

Answer 1

class BuildHistory {

// unpinall doesnt seem to wok so force it and return result
class func removeOldTable(className: String, completeBlock: @escaping (Bool) -> Void) {
let queryRem = PFQuery(className: className)
    queryRem.fromLocalDatastore()
    queryRem.findObjectsInBackground { (objects, error) in

        if objects != nil {

            PFObject.unpinAll(inBackground: objects)

            completeBlock(true)

        }
    }
}