# Chapter 17 - Improved Data Model

**URL:** <https://forums.kodeco.com/t/chapter-17-improved-data-model/121060>\
**Category:** iOS Apprentice\
**Created:** [September 26, 2020, 3:00am UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060 "2020-09-26T03:00:01Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![brozelle](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brozelle/32/81494_2.png) [@brozelle](https://forums.kodeco.com/u/brozelle)\
**Post date:** [September 26, 2020, 3:00am UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/1 "2020-09-26T03:00:02Z")

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I am using Xcode 11.7 and iOS Apprentice 8.3. I am working on Chapter 17. I have run into a problem where I no longer have data persistence. I modified the SceneDelegate.swift file according to the instructions. I also tried to compare the SceneDelegate.swift file with the one in the Chapter-17-final file supplied with the iOS Apprentice Tutorial. There is no such file. Please advise. Thank you.

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**Author:** ![fdorado985](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/fdorado985/32/110979_2.png) [@fdorado985](https://forums.kodeco.com/u/fdorado985)\
**Post date:** [September 28, 2020, 6:27am UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/2 "2020-09-28T06:27:38Z")

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What is your problem? - I’m finishing the chapter and I can persist the data, are you moving your app to background before stop it from Xcode?

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**Author:** ![brozelle](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brozelle/32/81494_2.png) [@brozelle](https://forums.kodeco.com/u/brozelle)\
**Post date:** [September 28, 2020, 2:55pm UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/3 "2020-09-28T14:55:28Z")

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I was not moving it to the background first. I do have data persistence. Thanks for the help.

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**Author:** ![gdelarosa](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/gdelarosa/32/109063_2.png) [@gdelarosa](https://forums.kodeco.com/u/gdelarosa)\
**Post date:** [September 28, 2020, 4:12pm UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/4 "2020-09-28T16:12:49Z")

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Hi @brozelle! Welcome to the forum community. Were you able to view the file after all?

Best,  
Gina

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**Author:** ![fdorado985](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/fdorado985/32/110979_2.png) [@fdorado985](https://forums.kodeco.com/u/fdorado985)\
**Post date:** [September 28, 2020, 4:16pm UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/5 "2020-09-28T16:16:28Z")

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Great news, there was a little note about stopping from Xcode kills your app with no mercy and doesn’t call disconnect. 👍🏿

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**Author:** ![brozelle](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brozelle/32/81494_2.png) [@brozelle](https://forums.kodeco.com/u/brozelle)\
**Post date:** [September 29, 2020, 12:24am UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/6 "2020-09-29T00:24:36Z")

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Yes. Thank you for your time!

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**Author:** ![system](https://s3.amazonaws.com/cdn.raywenderlich.com/community/forum-assets/noun-game-ghost-878668.png) [@system](https://forums.kodeco.com/u/system)\
**Post date:** [March 11, 2021, 7:00pm UTC](https://forums.kodeco.com/t/chapter-17-improved-data-model/121060/7 "2021-03-11T19:00:07Z")

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