method

before_destroy

Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: ActiveRecord::Acts::NestedSet::InstanceMethods

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1.2.6 (0)
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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v1.2.6) is shown here.

These similar methods exist in v7.1.3.2:

ActiveRecord::Callbacks::ClassMethods#before_destroy

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.

Show source

# File activerecord/lib/active_record/acts/nested_set.rb, line 199
        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.base_class.transaction {
            self.class.base_class.delete_all( "#{scope_condition} and #{left_col_name} > #{self[left_col_name]} and #{right_col_name} < #{self[right_col_name]}" )
            self.class.base_class.update_all( "#{left_col_name} = (#{left_col_name} - #{dif})",  "#{scope_condition} AND #{left_col_name} >= #{self[right_col_name]}" )
            self.class.base_class.update_all( "#{right_col_name} = (#{right_col_name} - #{dif} )",  "#{scope_condition} AND #{right_col_name} >= #{self[right_col_name]}" )
          }
        end

before_destroy

Related methods

Method deprecated or moved