Bad join for case tracker tables in views integration

The definition for all fields in views integration for casetracker is in some way, harcoded.

For example:

 function render($values) {
    if ($values->casetracker_case_case_priority_id) {
      return check_plain(casetracker_case_state_load($values->casetracker_case_case_priority_id, 'priority'));
    }
  }

Is only valid is node is the base table. But if a user want to perform a comment based view and join to the node comment using a relationship, and then get the status for this case, casetracker will not render this fields.

Patch attached.