module Sequel::Plugins::Tree::SingleRoot::InstanceMethods

Public Instance Methods

before_save() click to toggle source

Hook that prevents a second root from being created.

Calls superclass method
    # File lib/sequel/plugins/tree.rb
176 def before_save
177   if possible_root? && (root = model.root) && pk != root.pk
178     raise TreeMultipleRootError, "there is already a root #{model.name} defined"
179   end
180   super
181 end