gistfile1.txt

def test_update_nested
    ingredient = Factory.create(:ingredient)
    put :update, 
      :id=>ingredient.recipe.friendly_id,
      :recipe=> { 
        :name=> ingredient.recipe.name,
        :ingredients_attributes=>{
            "0"=>{
                :name=>ingredient.name,
                :amount=>ingredient.amount,
                :"id"=>ingredient.id,
                :_destroy=>"1"
            }
        }
      }
    recipe = Recipe.find(ingredient.recipe.id)
    assert_equal 0, recipe.ingredients.size
  end