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由 Jamie Macey 提交于
By default, resources routes are created with :resource/:id. A model defining to_param can make prettier urls by using something more readable than an integer ID, but since the route picks it up as :id you wind up with awkward User.find_by_username(params[:id]) calls. By overriding the key to be used in @request.params you can be more obvious in your intent.
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