On Wednesday, 8 October 2014 11:07:16 UTC-4, Ruby-Forum.com User wrote:
>
> I have an instance variable, @pages, which needs to be set up in a
> certain way at the end of several actions, so I thought to be clever and
> do it in the following way:
>
> # In my controller
>
> after_action :prepare_admin_home_data, only:
> [:adm_login,:adm_upload_selected]
>
> def adm_login
> ...
> render admin_pages_home_path
> ...
> end
>
> def prepare_admin_home_data
> @pages=Dir["#{AMP_DIR}/*"]
> logger.debug("+++++++++++ pages #{@pages.to_s}")
> end
>
> I can see from the logs, that @pages got the right value, but in my
> view, it is nil. It seems that the HTML code is constructed before the
> after_action is executed.
>
>
Correct. Code in `after_action` callbacks can examine and mutate the
about-to-be-sent response, but the render has already occurred.
> I understood the render() function in that way, that it only sets up
> which ERB template is supposed to be used, but actual rendering would
> occur only when the action has finished. Did I get this wrong?
>
>
When you call `render` the render happens immediately. If you return from
an action *without* rendering or redirecting, the default behavior will be
executed by ActionPack (rendering the template with the same name as the
action).
--Matt Jones
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