Module Sequel::Plugins::Tree::SingleRoot::InstanceMethods
In: lib/sequel/plugins/tree.rb

Methods

before_save  

Public Instance methods

before_save()

Hook that prevents a second root from being created.

[Source]

     # File lib/sequel/plugins/tree.rb, line 138
138:           def before_save
139:             if self[model.parent_column].nil? && (root = model.root) && pk != root.pk
140:               raise TreeMultipleRootError, "there is already a root #{model.name} defined"
141:             end
142:             super
143:           end

[Validate]