Nested controller actions testing

Question

In routes.rb i have:

resources :themes do
  resources :messages
end

In messages_controller_test.rb i have:

  setup do
    @theme = themes(:one)
    @message = messages(:one)
  end

  test "should create message" do
    assert_difference('Message.count') do
        post :create, message: { title: "Title", body: "Some body", theme_id: @theme.id }
    end

    assert_redirected_to theme_path(@theme)
  end

And i'm getting the error: Couldn't find Theme without an ID

What's going wrong?

Answer 1

With nested resources, the create route looks like this:

/themes/:theme_id/messages

so you need to pass these params:

test "should create message" do
  assert_difference('Message.count') do
      post :create, {theme_id: @theme.id, message: { title: "Title", body: "Some body", theme_id: @theme.id }}
  end

  assert_redirected_to theme_path(@theme)
end

And actually in your controller action you can handle that :theme_id param in order not to pass it anymore in params[:message]