form_for and scopes, rails 3

The answer I came up with was quite ugly, but works with both update and create:

<%= form_for(@article, :url => (@article.new_record? ? 
    articles_path(params[:tab]) : article_path(params[:tab], @article) do |f| %>

Update: A better solution would be to override the default_url_options-method to something like this:

def default_url_options(options={})
  { :tab => params[:tab] }
end

Then the <%= form_for @article do |f| %> could be used, and all urls are correctly generated

Try:

<%= form_for [:tab, @article] do |f| %>
   <%= f.label :title %>
   <%= f.text_field :title %>
    etc.
<%end%>

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