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CoreDataのHeavyMigration about ormcomparison-ios HOT 5 CLOSED

moriya-taichi commented on July 30, 2024

CoreDataのHeavyMigration

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Comments (5)

Moriya-Taichi commented on July 30, 2024

Lightweight Migration
下記の操作に対応。自動的にmigrationが行われる
- Addition of an attribut
- Removal of an attribute
- A nonoptional attribute becoming optional
- An optional attribute becoming non-optional, and defining a default value
- Renaming an entity or property
Heavyweight Migration

Use heavyweight (manual) migration in rare cases when changes to the data model exceed the capabilities of lightweight migration

公式の説明がこれしかない
Light以外の操作で使われる
RealmやGRDBと同じでマニュアルでmigrationする。
日本語でやり方を書いている記事はなさそう。

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Moriya-Taichi commented on July 30, 2024

https://medium.com/@shakya4577/heavyweight-core-data-migration-51570555124b

この記事だとNSEntityMigrationPolicyのサブクラスを作って
マッピングを書けばできるらしい。
起動時などにmigration()的な形で明示的に呼んでいる訳ではないので
自動的に呼ばれる？

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Moriya-Taichi commented on July 30, 2024

英語の文献でも少ない
https://www.objc.io/issues/4-core-data/core-data-migration/
obj-cだけど書いてた

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Moriya-Taichi commented on July 30, 2024

https://williamboles.me/step-by-step-core-data-migration/
ここによると*.xcmappingmodel or NSEntityMigrationPolicyでマイグレーションを書いたら勝手にやってくれるらしい
マッピングモデルを探して、見つからない時はLightWeightを実行するとのこと

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Moriya-Taichi commented on July 30, 2024

とりあえずはNSEntityMigrationPolicyを書こう！でよさげ

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