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由 Ryuta Kamizono 提交于
`ClassSpecificRelation` has `method_missing` and the `method_missing` is called first. if an associated class has the missing method in a relation, never reach to the `method_missing` in the `CollectionProxy`. I extracted `DelegateExtending` and included it to the delegate class that including `ClassSpecificRelation` to fix the issue. Fixes https://github.com/rails/rails/pull/28246#issuecomment-296033784.
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