__PACKAGE__->parent_column('parent_id');
Declares the name of the column that contains the self-referential
-ID which defines the parent row. Defaults to "parent_id". This
-will create a has_many (children) and belongs_to (parent)
-relationship.
+ID which defines the parent row. This will create a has_many (children)
+and belongs_to (parent) relationship.
-This method also setups an additional has_many relationship called
+This method also sets up an additional has_many relationship called
parents which is useful when you want to treat an adjacency list
as a DAG.
$b->parent( $d );
-Since D is a descendant of B then all of B's siblings get their parent
+Since D is a descendant of B then all of D's siblings get their parent
changed to A. Then B's parent is set to D.
A