function customFieldsToSpreadsheet()
{
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("My Database");

  if(!sheet)
  {
    sheet = ss.insertSheet("My Database");
  }

  new Trellinator().board("My Board").cards().each(function(card)
  {
    var current_row = [];
    current_row.push(card.name());
    current_row.push(card.link());

    card.customFields().each(function(field)
    {
      current_row.push(card.customFieldValue(field.name));
    });

    sheet.appendRow(current_row);
  });
}