Relationships

I am trying to write Views integration code for my custom tables. The integration (generated with this module) works fine when I only want to list the content in one single table but I do not manage to make a join in the created code and than get this to work in Views. I have make a simple example module to test this and pasted this in the created code in tabeller.views.inc after the base section

    'join' => array(
    'table_last' => array(
    'handler' => 'views_join', 
    'left_table' => 'table_first', 
    'left_field' => 'last_id',
    'field' => 'last_id',
    ),
  ),

The tables shows up in Views but I do not get the relationships. Is it any wrong with my code or have I misunderstood the concept in Views?
It would be very helpful with a small join example in the documentation.
The hole file tabeller.views.inc:

$data['table_first'] = array(
  'table' => array(
    'base' => array(
      'field' => 'id',
      'title' => 'Table First',
      'help' => 'List first names',
    ),
    'join' => array(
	'table_last' => array(
      'handler' => 'views_join', 
      'left_table' => 'table_first',
      'left_field' => 'last_id',
      'field' => 'last_id',
    ),
	),
    'group' => 'Table First',
  ),
  'id' => array(
    'title' => 'Id',
    'help' => 'Primary key',
    'field' => array(
      'handler' => 'views_handler_field_numeric',
      'click sortable' => FALSE,
    ),
  ),
  'last_id' => array(
    'title' => 'Last Id',
    'help' => 'Links to last name',
    'field' => array(
      'handler' => 'views_handler_field_numeric',
      'click sortable' => FALSE,
    ),
  ),
  'first' => array(
    'title' => 'First',
    'help' => 'First name',
    'field' => array(
      'handler' => 'views_handler_field',
      'click sortable' => FALSE,
    ),
  ),
);
$data['table_last'] = array(
  'table' => array(
    'base' => array(
      'field' => 'last_id',
      'title' => 'Table Last',
      'help' => 'List names',
    ),
    'group' => 'Table Last',
  ),
  'last_id' => array(
    'title' => 'Last Id',
    'help' => 'Primary key',
    'field' => array(
      'handler' => 'views_handler_field_numeric',
      'click sortable' => FALSE,
    ),
  ),
  'name' => array(
    'title' => 'Name',
    'help' => 'Last name',
    'field' => array(
      'handler' => 'views_handler_field',
      'click sortable' => FALSE,
    ),
  ),
);
    return $data;
  }