我在appDelegate中收到错误？

Question

当我尝试将待办事项列表应用程序的代码从preCoreData更改为coreData时。

我收到此错误：

'NSInvalidArgumentException'，原因：'executeFetchRequest：错误：获取请求必须有实体。'

this is the preCoreData app link

this is the CoreData app link

Answer 1

我的代码中缺少实体名称

我的代码有错误

 func taskFetchRequest() -> NSFetchRequest {

  

让fetchRequest = NSFetchRequest（）

    let sortDescriptor = NSSortDescriptor(key: "date", ascending: true)
    let completedDescriptor = NSSortDescriptor(key: "completed", ascending: true)
    fetchRequest.sortDescriptors = [completedDescriptor, sortDescriptor]

    return fetchRequest
}

我的代码没有错误

 func taskFetchRequest() -> NSFetchRequest {

  

让fetchRequest = NSFetchRequest（entityName：“TaskModel”）

    let sortDescriptor = NSSortDescriptor(key: "date", ascending: true)
    let completedDescriptor = NSSortDescriptor(key: "completed", ascending: true)
    fetchRequest.sortDescriptors = [completedDescriptor, sortDescriptor]

    return fetchRequest
}