change_column

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 279
      def change_column(table_name, column_name, type, options = {}) #:nodoc:
        alter_table(table_name) do |definition|
          definition[column_name].instance_eval do
            self.type    = type
            self.limit   = options[:limit] if options.include?(:limit)
            self.default = options[:default] if options.include?(:default)
            self.null    = options[:null] if options.include?(:null)
            self.precision = options[:precision] if options.include?(:precision)
            self.scale = options[:scale] if options.include?(:scale)
            self.collation = options[:collation] if options.include?(:collation)
          end
        end
      end