method

before_destroy

v1.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::Acts::NestedSet::InstanceMethods

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What's this?

before_destroy() public

Prunes a branch off of the tree, shifting all of the elements on the right back to the left so the counts still work.

# File activerecord/lib/active_record/acts/nested_set.rb, line 200
        def before_destroy
          return if self[right_col_name].nil? || self[left_col_name].nil?
          dif = self[right_col_name] - self[left_col_name] + 1

          self.class.transaction {
            self.class.delete_all( "#{scope_condition} and #{left_col_name} > #{self[left_col_name]} and #{right_col_name} < #{self[right_col_name]}" )
            self.class.update_all( "#{left_col_name} = (#{left_col_name} - #{dif})",  "#{scope_condition} AND #{left_col_name} >= #{self[right_col_name]}" )
            self.class.update_all( "#{right_col_name} = (#{right_col_name} - #{dif} )",  "#{scope_condition} AND #{right_col_name} >= #{self[right_col_name]}" )
          }
        end

before_destroy

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