ios - 魔术记录-MR_createEntity返回nil

我找不到我的代码出了什么问题。我正在尝试将MagicalRecord与Swift结合使用。当我在做简单的createEntity时，它的值为零:

let a = Subject.MR_createEntity() <--- This line is working perfectly
let b = Points.MR_createEntity()  <--- This line returns nil
let c = Class.MR_createEntity()   <--- This line returns nil

这是我的类实现:

学科:

@objc(Subject)
class Subject: NSManagedObject {

    @NSManaged var name: String?
    @NSManaged var classes: NSSet?
}

类:

@objc(Class)
class Class: NSManagedObject {

    @NSManaged var name: String?
    @NSManaged var teacherName: String?
    @NSManaged var subject: Subject?
    @NSManaged var points: NSSet?
}

要点:

@objc(Points)
class Points: NSManagedObject {

    @NSManaged var date: NSDate?
    @NSManaged var points: NSNumber?
    @NSManaged var maxPoints: NSNumber?
    @NSManaged var classType: Class?
}

然后从.xcdatamodel屏幕:

最佳答案

初始化MagicalRecord时，您可以启用核心数据日志，然后您将知道创建实体失败时会发生什么。

MagicalRecord.setLoggingLevel(MagicalRecordLoggingLevel.Warn)

关于ios - 魔术记录-MR_createEntity返回nil，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37058708/