回答編集履歴
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参考情報を追加
test
CHANGED
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@@ -33,3 +33,7 @@
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33
33
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end
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```
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36
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+
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37
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参考
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38
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39
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[PostgreSQL vs. Rails migration: How to change columns from string to integer](https://makandracards.com/makandra/18691-postgresql-vs-rails-migration-how-to-change-columns-from-string-to-integer)
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