rspec test fail with: Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id

[RaeuberKneissl]

Hi,

I am getting an error in rspec. In the view itself it works without a problem.

Here is how i use it:
config/will_filter/config.yml is not changed.

model client.rb:
belongs_to :license
has_one :license_key

clients_controller.rb:
def index
@Clients = Client.filter(:params => params)
end

index.html.haml:
%p= will_filter_tag(@Clients)
= will_filter_table_tag(@Clients)

index.html.haml_spec.rb:
require 'spec_helper'

describe "clients/index" do
before(:each) do
assign(:clients, [
stub_model(Client),
stub_model(Client)
])
end

it "renders a list of clients" do
render
end
end

RSpec error message:
Failures:

1. clients/index renders a list of clients
   Failure/Error: render
   ActionView::Template::Error:
   Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id

   ./app/views/clients/index.html.haml:1:in `_app_views_clients_index_html_haml__2707070858207547506_2179859460'

   ./spec/views/clients/index.html.haml_spec.rb:12:in`block (2 levels) in <top (required)>'

I can't find the cause for the failing rspec.