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Rails 3 routing: include flash params with root redirect
root :to => redirect("/dashboard")

root :to => redirect do |p, req|
  req.flash.keep
  "/dashboard"
end

root :to => redirect { |p, req| req.flash.keep; "/dashboard" }

redirect_to root_url, :notice => "test flash notice"

<% if request.referer.scan('yoursitename').size == 0 %>
 <%= create your own notice here %>
<% end %>

redirect_to '/dashboard'