Active admin saving selection from collection_select and passing to controller

Rails
1

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| %>

<%= f.collection_select :recipe_id, Recipe.all,:id,:name,:prompt => true%>

<%= f.collection_select :menu_id, Menu.all,:id,:name,:prompt => true%>

<%= 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