active admin saving selection from collection_select and passing to controller

hi i am using active admin for my app i have a partial with a drop down list where the menu and recipe are populated this page is to group the recipe in a menu _menu_recipe.html.erb

<%= semantic_form_for [:admin, @menu_recipe] do |f| %>

<p> <%= f.collection_select :recipe_id,   Recipe.all,:id,:name,:prompt => true%> </p> <p> <%= f.collection_select :menu_id,   Menu.all,:id,:name,:prompt => true%> </p> <%= f.buttons :commit %> <%end%> when ever i try to catch the and create or group it, it comes with a Couldn't find Recipe without an ID error

my active admin controller which i override is

ActiveAdmin.register MenuRecipe do     menu :parent => "Manage Package"

   form :partial => "menu_recipe"

    controller do       def new         new! do |format|           @menu_recipe = MenuRecipe.new         end       end

      def create         create! do |format|           recipe = Recipe.find(params[:recipe_id])           menu = Menu.find(params[:menu_id])           @menu_recipe = @menu.add_recipe(menu.id)

          if @menu_recipe.save             redirect_to {admin_menu_recipe_url}           end         end       end     end

end i cant seems to get the current menu and recipe that i group