ios - 将当前用户存储在核心数据中

Question

我的代码发生了一些非常奇怪的事情，我不知道如何修复它。当我想在核心数据中存储一些用户时，它可以工作，但是当我想存储当前用户时，它不起作用，显然我尝试保存的数据为零，但是当我将相同的数据打印到日志时，一切似乎都是这样完全没问题

在 for 循环中，我循环遍历要存储的所有用户，如果用户名等于当前用户，则存储当前用户，否则存储其他用户。

这真的很奇怪，因为通常添加当前用户或添加其他用户这两种操作都是相同的。

我的代码:

    var managedObjectContext = AppDelegate().managedObjectContext

// MARK - Adding all the users in Core data
for userFromParseDataBase in usersFromParseDataBase {

    let entity = NSEntityDescription.entityForName("Users", inManagedObjectContext: self.managedObjectContext)
    let newUser = Users(entity: entity!, insertIntoManagedObjectContext: self.managedObjectContext)

    // Checking if the current user is correctly logged in
    if userFromParseDataBase.username == userName {

        print(userFromParseDataBase.username)
        print(userFromParseDataBase.profileName)

        // Adding other users interacting with currentUser
        newUser.username = userFromParseDataBase.username
        print(newUser.username)
        newUser.profileName = userFromParseDataBase.profileName
        let imageData = try! userFromParseDataBase.profileImage.getData()
        if (imageData.length != 0){
            newUser.photo = imageData
        }
        newUser.currentUser = true
        newUser.added = false

        do {
            try newUser.managedObjectContext?.save()
            self.usersFromCoreData.append(newUser)
            print("TEST 1 - current user has been saved to core data")
        } catch {
            let saveError = error as NSError
            print("ERROR CURRENT USERS : \(saveError), \(saveError.userInfo)")
        }

        // Checking if there are added users
    }else if self.arrayAddedUsers.contains(userFromParseDataBase.username) {

        // Adding added users
        newUser.username = userFromParseDataBase.username
        newUser.profileName = userFromParseDataBase.profileName
        let imageData = try! userFromParseDataBase.profileImage.getData()
        if (imageData.length != 0){
            newUser.photo = imageData
        }
        newUser.currentUser = false
        newUser.added = true
        do {
            try newUser.managedObjectContext?.save()
            self.usersFromCoreData.append(newUser)
            print("TEST 1 - added user has been saved to core data")
        } catch {
            let saveError = error as NSError
            print("ERROR ADDED USERS :\(saveError), \(saveError.userInfo)")
        }

        // Checking if the current user interacts with users that have not been added
    }else if self.arrayGroupMembers3.contains(userFromParseDataBase.username){

        print(userFromParseDataBase.username)
        print(userFromParseDataBase.profileName)

        // Adding other users interacting with currentUser
        newUser.username = userFromParseDataBase.username
        print(newUser.username)
        newUser.profileName = userFromParseDataBase.profileName
        let imageData = try! userFromParseDataBase.profileImage.getData()
        if (imageData.length != 0){
            newUser.photo = imageData
        }
        newUser.currentUser = false
        newUser.added = false

        do {
            try newUser.managedObjectContext?.save()
            self.usersFromCoreData.append(newUser)
            print("TEST 3 - interacting user has been saved to core data")
        } catch {
            let saveError = error as NSError
            print("ERROR INTERACTING USERS : \(saveError), \(saveError.userInfo)")
        }
    }else {
        print("No condition is true")
    }

}

这就是打印到日志的内容，我打印所有内容，因为重要的是要看到我传递的数据不应该为零:

antoine@info.com
antoine
Optional("antoine@info.com")
TEST 2 - interacting user has been saved to core data
thomas@info.com
thomas
Optional("thomas@info.com")
ERROR CURRENT USERS : Error Domain=NSCocoaErrorDomain Code=1560 "(null)" UserInfo={NSDetailedErrors=(
"Error Domain=NSCocoaErrorDomain Code=1570 \"The operation couldn\U2019t be completed. (Cocoa error 1570.)\" UserInfo={NSValidationErrorKey=profileName, NSLocalizedDescription=The operation couldn\U2019t be completed. (Cocoa error 1570.), NSValidationErrorObject=<WeGrupp.Users: 0x7fd4d0c3fe60> (entity: Users; id: 0x7fd4d0c13310 <x-coredata:///Users/t9279CD60-1946-485B-BE68-F1EE10D8ACFE4> ; data: {\n    added = 0;\n    currentUser = 0;\n    groups =     (\n    );\n    photo = nil;\n    profileName = nil;\n    username = nil;\n})}",
"Error Domain=NSCocoaErrorDomain Code=1570 \"The operation couldn\U2019t be completed. (Cocoa error 1570.)\" UserInfo={NSValidationErrorKey=username, NSLocalizedDescription=The operation couldn\U2019t be completed. (Cocoa error 1570.), NSValidationErrorObject=<WeGrupp.Users: 0x7fd4d0c3fe60> (entity: Users; id: 0x7fd4d0c13310 <x-coredata:///Users/t9279CD60-1946-485B-BE68-F1EE10D8ACFE4> ; data: {\n    added = 0;\n    currentUser = 0;\n    groups =     (\n    );\n    photo = nil;\n    profileName = nil;\n    username = nil;\n})}")}, [NSDetailedErrors: (
"Error Domain=NSCocoaErrorDomain Code=1570 \"The operation couldn\U2019t be completed. (Cocoa error 1570.)\" UserInfo={NSValidationErrorKey=profileName, NSLocalizedDescription=The operation couldn\U2019t be completed. (Cocoa error 1570.), NSValidationErrorObject=<WeGrupp.Users: 0x7fd4d0c3fe60> (entity: Users; id: 0x7fd4d0c13310 <x-coredata:///Users/t9279CD60-1946-485B-BE68-F1EE10D8ACFE4> ; data: {\n    added = 0;\n    currentUser = 0;\n    groups =     (\n    );\n    photo = nil;\n    profileName = nil;\n    username = nil;\n})}",
"Error Domain=NSCocoaErrorDomain Code=1570 \"The operation couldn\U2019t be completed. (Cocoa error 1570.)\" UserInfo={NSValidationErrorKey=username, NSLocalizedDescription=The operation couldn\U2019t be completed. (Cocoa error 1570.), NSValidationErrorObject=<WeGrupp.Users: 0x7fd4d0c3fe60> (entity: Users; id: 0x7fd4d0c13310 <x-coredata:///Users/t9279CD60-1946-485B-BE68-F1EE10D8ACFE4> ; data: {\n    added = 0;\n    currentUser = 0;\n    groups =     (\n    );\n    photo = nil;\n    profileName = nil;\n    username = nil;\n})}")]

如果有人找到我的问题的解决方案，我将非常感激，我真的不知道如何解决这个问题!

Answer 1

如果你查看苹果文档，你会发现:

NSValidationMultipleErrorsError = 1560, NSValidationMissingMandatoryPropertyError = 1570,

这可能意味着您尝试保存强制属性设置为 nil 的对象。

关于错误，您可以在那里找到: https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreData/ObjectValidation.html

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/CoreDataFramework/Miscellaneous/CoreData_Constants/