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executeFetchRequest:error: A fetch request must have an entity

作者您好!我是Swift初学者,对iOS中对SAMBA的应用很感兴趣,很感谢您分享的代码!估计您也是**人,就直接写中文了。
向您提交个问题,这个工程我用Xcode8.3编译通过,可以在iPad上执行,就是在进入目录,按右上角的Select时,Xcode会报错:
xComic[6015:684484] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'executeFetchRequest:error: A fetch request must have an entity.'
指向的代码是 ChooserViewController.swift文件中的函数private func findComic(_ context: NSManagedObjectContext, title: String) -> ComicRecord? 中的这行:

let comics = try context.fetch(r)
望能拨冗看下代码,不胜感激!

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