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由 Yves Senn 提交于
The current implementation only works correctly if you supply the `:controller` with directory notation (eg. `:controller => 'admin/posts'`). The ruby constant notation (eg. `:controller => 'Admin::Posts`) leads to unexpected problems with `url_for`. This patch prints a warning for every non supported `:controller` option. I also added documentation how to work with namespaced controllers. The warning links to that documentation in the rails guide.
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