How to update data if same key exists in mongodb?-CodePudding

I am inserting data from csv file, i want to update if object key has same then new price will just update, i have used csvtojson for parsing csv file and multer for file upload.

csv file has itemNumber, title and price column

sample.csv

itemNumber,title,price
STY0047,Men Straight Fit Jeans,2500
STY0048,Men Straight Fit Jeans,2450
STY0049,Men Straight Fit Jeans,2550
STY0050,Men Straight Fit Jeans,3000
STY0048,Men Straight Fit Jeans,4000
STY002,Men Straight Fit Jeans,2550
STY0053,Men Straight Fit Jeans,3000
STY0054,Men Straight Fit Jeans,3000
STY0043,Men Straight Fit Jeans,4000

My code

router.post("/file-insert-data", upload, async function (req, res, next) {

  if (!req.file) {
    return res.status(400).send("no file found");
  }

  const results = await csv().fromFile(req.file.path);

  for (let obj in results ) {
      const csvData = new csvModel(results [obj])

      csvData.save((err, data) => {
        if(err) {
          return res.status(400).send("csv data is not inserted")
        }
        return res.status(201).send(data)
      })
    }
  
});

Help me Thanks

CodePudding user response：

This is some regular javascript but it highlights upsert functionality and features generic addition of new fields.

// Assume results is an array of objects:                                                           
results.forEach(function(item) {
    var prx = item['price']; // grab the price from the item...                                     

    // ...and now REMOVE it.  This is because fields cannot appear in                               
    // both $set and $setOnInsert.  Our trick here is to make the $setOnInsert                         
    // generic.  ANY fields that are NOT itemNumber or price will automatically                     
    // be added upon first insert.  It should be obvious that if you need                           
    // to upsert more things (i.e. more things to $set), then delete them from                      
    // the object too.  Note: $setOnInsert will only store the fields from                          
    // item upon first insert.  New fields in later items with an existing                          
    // key will NOT be updated.  Comment out the delete and see the error
    // message re. path conflict:                                                                    
    delete item['price'];

    rc=db.foo.updateOne({itemNumber: item['itemNumber']},
                     {$set: {price: prx}
                      ,$setOnInsert: item // Ah!  Set the WHOLE OBJECT.                             
                     },
                     { upsert: true }
                    );
});

CodePudding user response：

Try to use the findOne function to check if the element already exists (I assume that itemNumber is key for the model).
If not, create a new instance of csvModel
Update the price
Save the data

router.post('/file-insert-data', upload, async function (req, res, next) {
  if (!req.file) {
    return res.status(400).send('no file found');
  }

  try {
    const results = await csv().fromFile(req.file.path);
    let updatedData = []; // Array to store the updated data
    for (const item of results) {
      const { itemNumber, title, price } = item;
      let csvData = await csvModel.findOne({ itemNumber });
      if (!csvData) {
        // Create new data if not present
        csvData = new csvModel();
        csvData.itemNumber = itemNumber;
        csvData.title = title;
      }
      // Update the price
      csvData.price = price;

      // Save the created / updated data
      await csvData.save();

      updatedData.push(csvData);
    }

    return res.status(201).send(updatedData);
  } catch (err) {
    return res.status(500).send('Error updating data');
  }
});