zunda<p>あれれれれれ？</p><p>== 20180206000000 ChangeUserIdNonnullable: migrating ==========================</p><p>rake aborted!</p><p>StandardError: An error has occurred, this and all later migrations canceled:</p><p>=== Dangerous operation detected <a href="https://mastodon.zunda.ninja/tags/strong_migrations" class="mention hashtag" rel="tag">#<span>strong_migrations</span></a> ===</p>
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zunda<p>どうしてくれよう…</p><p>== 20191212003415 IncreaseBackupSize: migrating ===============================<br />rake aborted!<br />StandardError: An error has occurred, this and all later migrations canceled:</p><p>=== Dangerous operation detected <a href="https://mastodon.zunda.ninja/tags/strong_migrations" class="mention hashtag" rel="tag">#<span>strong_migrations</span></a> ===</p><p>Changing the type of an existing column requires the entire<br />table and indexes to be rewritten. A safer approach is to:</p><p>1. Create a new column<br />2. Write to both columns<br />3. Backfill data from the old column to the new column<br />4. Move reads from the old column to the new column<br />5. Stop writing to the old column<br />6. Drop the old column</p><p>/app/db/migrate/20191212003415_increase_backup_size.rb:3:in `up'</p>
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