method

before_destroy

v1.2.6 - Show latest stable - 0 notes - Class: ActiveRecord::Acts::NestedSet::InstanceMethods

1.0.0 (0)
1.1.6 (0)
1.2.6 (0)
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2
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 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

Flowdock - Team Inbox With Chat for Software Developers