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poly.md
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-# Polymorphic Association 多型關聯
+# 什麼是 Polymorphic Association 多型關聯
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使用場景例如,你的網站上有圖片 (Image) 和影片 (Video) 兩種 model,而 PM 告訴你,他想要讓這兩種 model 都可以留言 (Comment)
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