ios - Easy Mapping 不映射 Core Data 一对多关系对象

Question

我使用 EasyMapping 库将对象从 JSON 解码到我的核心数据对象。 Object Balance 与 Transaction 有一对多关系，这是我的 nsmanaggedobject 类:

class Balance: NSManagedObject, EKManagedMappingProtocol {

static func objectMapping() -> EKManagedObjectMapping! {
    return EKManagedObjectMapping.init(forEntityName: String(self), withBlock: { (mapping) -> Void in

        mapping.mapKeyPath("balance.amount", toProperty: "amount")

        mapping.hasMany(Transaction.self, forKeyPath: "transactions")
    })
}

}

这是我的翻译位:

        let b = Balance.MR_createEntityInContext(localContext)

        EKMapper.fillObject(b, fromExternalRepresentation: parsedInfo, withMapping: Balance.objectMapping())

我的实体创建良好，但没有关系。将不胜感激任何关于为什么不起作用的想法

Answer 1

找到解决方案，需要像下面这样从EKManagedObjectModel继承实体类

class Balance: EKManagedObjectModel {

static func objectMapping() -> EKManagedObjectMapping! {
return EKManagedObjectMapping.init(forEntityName: String(self), withBlock: { (mapping) -> Void in

    mapping.mapKeyPath("balance.amount", toProperty: "amount")

    mapping.hasMany(Transaction.self, forKeyPath: "transactions")
    })
  }
}

翻译会是

        MagicalRecord.saveWithBlock({ (localContext) -> Void in

        let b = Balance.objectWithProperties(parsedPersonInfo, inContext: localContext)
 ...
}