updating(PUT) array in express js

Question

i am using expressjs(nodejs). I am trying to store array data while updating existing data ( dealtype & dealprice ), but unable to do so.

my existing dataset

{
 "_id": "56a59a2923e047bc2128cd99",
 "foodImageUrl": "modules/foods/client/img/food.jpg",
 "deal": [
  {
   "_id": "56a59a2923e047bc2128cd9a",
   "dealprice": "asd",
   "dealtype": "asd"
  }
 ],
 "name": "ads",
 "created": "2016-01-25T03:44:41.346Z"
}

my expressjs controller

exports.update = function (req, res) {
var food = req.food;

  food.name = req.body.name;
  food.deal.dealtype = req.body.deal.dealtype;
  food.deal.dealprice = req.body.deal.dealprice;
  food.foodImageUrl = req.body.foodImageUrl;

  food.save(function (err) {
    if (err) {
      return res.status(400).send({
        message: errorHandler.getErrorMessage(err)
      });
    } else {
      res.json(food);
    }
  });
};

Answer 1

One way to update the existing document. First of all, find the document need to changed by _id or other key word. here is one sample by _id .

Food.findOne({_id: req.food._id}, function(err, food) {
  food.name = req.body.name;
  food.deal.dealtype = req.body.deal.dealtype;
  food.deal.dealprice = req.body.deal.dealprice;
  food.foodImageUrl = req.body.foodImageUrl;

  food.save(function (err) {
    if (err) {
      return res.status(400).send({
        message: errorHandler.getErrorMessage(err)
      });
    } else {
      res.json(food);
    }
  });
});

Or just use the findOneAndUpdate to update the existing document.