module ClosureTree::NumericOrderSupport::MysqlAdapter

Public Instance Methods

reorder_with_parent_id(parent_id, minimum_sort_order_value = nil) click to toggle source
# File lib/closure_tree/numeric_order_support.rb, line 16
      def reorder_with_parent_id(parent_id, minimum_sort_order_value = nil)
        return if parent_id.nil? && dont_order_roots
        min_where = if minimum_sort_order_value
          "AND #{quoted_order_column} >= #{minimum_sort_order_value}"
        else
          ""
        end
        connection.execute 'SET @i = 0'
        connection.execute <<-SQL.squish
          UPDATE #{quoted_table_name}
            SET #{quoted_order_column} = (@i := @i + 1) + #{minimum_sort_order_value.to_i - 1}
          WHERE #{where_eq(parent_column_name, parent_id)} #{min_where}
          ORDER BY #{nulls_last_order_by}
        SQL
      end