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add_column(table_name, column_name, type, options = {}) public

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# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 303
      def add_column(table_name, column_name, type, options = {})
        native_type = native_database_types[type]
        sql_commands = ["ALTER TABLE #{table_name} ADD #{column_name} #{type_to_sql(type, options[:limit])}"]
        if options[:default]
          sql_commands << "ALTER TABLE #{table_name} ALTER #{column_name} SET DEFAULT '#{options[:default]}'"
        end
        if options[:null] == false
          sql_commands << "ALTER TABLE #{table_name} ALTER #{column_name} SET NOT NULL"
        end
        sql_commands.each { |cmd| execute(cmd) }
      end
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