extract_foreign_key_action

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 886
      def extract_foreign_key_action(structure, name, action) # :nodoc:
        if structure =~ /CONSTRAINT #{quote_column_name(name)} FOREIGN KEY .* REFERENCES .* ON #{action} (CASCADE|SET NULL|RESTRICT)/
          case $1
          when 'CASCADE'; :cascade
          when 'SET NULL'; :nullify
          end
        end
      end