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change_column_null(table_name, column_name, null, default = nil) public

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# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 1042
      def change_column_null(table_name, column_name, null, default = nil)
        clear_cache!
        unless null || default.nil?
          execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
        end
        execute("ALTER TABLE #{quote_table_name(table_name)} ALTER #{quote_column_name(column_name)} #{null ? 'DROP' : 'SET'} NOT NULL")
      end
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