module Sequel::Plugins::Tree::SingleRoot::InstanceMethods
Public Instance Methods
before_save()
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Hook that prevents a second root from being created.
Calls superclass method
# File lib/sequel/plugins/tree.rb 171 def before_save 172 if possible_root? && (root = model.root) && pk != root.pk 173 raise TreeMultipleRootError, "there is already a root #{model.name} defined" 174 end 175 super 176 end