public static function update($id)
{
$modifiedDrink = Drink::findOne($id);
$name = $_POST['drink_name'];
$errors = Drink::validateEditedDrink_name($name);
DrinkController::validateNameErrors($errors, $id);
$ingredients = $_POST['ingredients'];
DrinkController::validateIngredientsEdit($name, $ingredients, $id);
$amounts = $_POST['amounts'];
DrinkController::validateAmountEdit($name, $ingredients, $id, $amounts);
$units = $_POST['units'];
$ingredient_ids = $_POST['ingredient_id'];
DrinkController::editIngredients($ingredients, $id, $ingredient_ids, $amounts, $units);
$modifiedDrink->setDrink_name($name);
$modifiedDrink->setDrink_type($_POST['drink_type']);
$modifiedDrink->setInstructions($_POST['instructions']);
$modifiedDrink->update();
Redirect::to('/drink/' . $modifiedDrink->getDrink_id(), array('message' => 'Drink has been modified.'));
}