change_column_default

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 319
      def change_column_default(table_name, column_name, default_or_changes) # :nodoc:
        default = extract_new_default_value(default_or_changes)

        alter_table(table_name) do |definition|
          definition[column_name].default = default
        end
      end