回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,31 @@
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「スコープ演算子」ですね。
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```
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Article::Tagging < ::Tagging
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↓ こんな配置とか？
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├─tagging.rb
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└─article/
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└─tagging.rb
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```
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