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Ruby on Rails: url_for :back leads to NoMethodError for back_url

Answer 1

+2 A:

You are trying to use a view helper method in your controller. The behavour you expect resides in ActionView::Helpers::UrlHelper, but the method you are calling is in ActionController::Base. Unfortunately, both methods are named the same and have very similar functions, but not exactly the same.

For a quick fix, ActionController::Base sets a @template variable which has access to all the ActionView helpers. Try calling url_for from that object, like this:

if params[:redirect]
  @url = params[:redirect]
else
  @url = @template.url_for :back
  @url ||= url_for :controller => "home", :action => "index"
end

I'm not sure that's the "right" way to do it, however. If the rails developers wanted us to use the @template variable all willy-nilly, they'd advertise it more.

Another way to get the URL to the original referrer (the :back you're looking for) is by using the request method:

if params[:redirect]
  @url = params[:redirect]
else
  @url = request.env["HTTP_REFERER"]
  @url ||= url_for :controller => "home", :action => "index"
end

irkenInvader 2010-05-26 02:30:27

That works. I now have an error in the view, also with url_for, but what you said has fixed this error. Thanks :-) (+1)

Platinum Azure 2010-05-26 03:20:13

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Ruby on Rails: url_for :back leads to NoMethodError for back_url

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