def insert!(model, attributes={})
  attributes = attributes.stringify_keys
  begin
    record = model.new {|r| r.send(:attributes=, attributes, false) }
    def record.callback(*args)
      # inhibit all callbacks
    end
    record.save(false)
  rescue ActiveRecord::StatementInvalid
    if $!.message =~ /Column '(.+?)' cannot be null/
      unless attributes.key?($1)
        attributes[$1] = record.column_for_attribute($1).number? ? 0 : ""
        retry
      end
    end
    raise
  end
  return record
end