Why? When choosing a parent from a select box, the "include_blank" value is a blank string. This end up creating a tree node with a nil value for a parent, even if the database default is 0. Besides, there's no value in differentiating parent_id of nil or 0.
Why? When choosing a parent from a select box, the "include_blank" value is a blank string. This end up creating a tree node with a nil value for a parent, even if the database default is 0. Besides, there's no value in differentiating parent_id of nil or 0.