public function taxonomy($primary = null, $where = null)
{
// possible to exclude a relationship connection
if (!is_null($primary) && !empty($primary)) {
$this->primaryKey = $primary;
}
// load relationship
$relation = $this->hasOne('Corcel\\TermTaxonomy', 'term_taxonomy_id');
// do we need to filter which value to look for with meta_value
// if (!is_null($where) && !empty($where)) {
// $relation->where($where, $this->meta_value);
// }
return $relation;
}