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由 Marcel M. Cary 提交于
I was puzzled about why `collection=` was destroying the removed records on an association with `dependent: :destroy`, even after consulting the documentation for that option. I had to dive into the Active Record source to understand what was going on: eventually `collection=` calls `collection.delete` on the ousted records, and it also uses the `:dependent` option to decide how to remove records. It would have helped me to have mention of this in the documentation for `:dependent`, not just under `collection.delete` (which I found much later). Briefly mention the broader impacts of `:dependent` in the Association Basics guide. [ci skip]
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