MongoDB- Insert if it doesn't exist, else skip

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Is it possible to insert in Mongo with condition;

//Pseudo code

Bulk Insert Item :

If Key exists
    Skip, don't throw error
If key does not exist
    Add item

If i do single inserts, it might return an error or insert in the collection, but is it possible in bulk ?

You have two real choices here depending on how you want to handle things:

  1. Use upsert functionality of MongoDB to essentially "lookup" if the key data exists. If not then you only pass in data to $setOnInsert and that will not touch anything else.

  2. Use "UnOrdered" operations in Bulk. The whole batch of updates will continue even if an error is returned, but the error report(s) are just that, and anything that is not an error will be comitted.

Whole example:

var async = require('async'),
    mongoose = require('mongoose'),
    Schema = mongoose.Schema;

var testSchema = new Schema({
  "_id": Number,
  "name": String
},{ "_id": false });

var Test = mongoose.model('Test',testSchema,'test');

mongoose.connect('mongodb://localhost/test');

var data = [
  { "_id": 1, "name": "One" },
  { "_id": 1, "name": "Another" },
  { "_id": 2, "name": "Two" }
];

async.series(
  [
    // Start fresh
    function(callback) {
      Test.remove({},callback);
    },

    // Ordered will fail on error. Upserts never fail!
    function(callback) {
      var bulk = Test.collection.initializeOrderedBulkOp();
      data.forEach(function(item) {
        bulk.find({ "_id": item._id }).upsert().updateOne({
          "$setOnInsert": { "name": item.name }
        });
      });
      bulk.execute(callback);
    },

    // All as expected
    function(callback) {
      Test.find().exec(function(err,docs) {
        console.log(docs)
        callback(err);
      });
    },


    // Start again
    function(callback) {
      Test.remove({},callback);
    },

    // Unordered will just continue on error and record an error
    function(callback) {
      var bulk = Test.collection.initializeUnorderedBulkOp();
      data.forEach(function(item) {
        bulk.insert(item);
      });
      bulk.execute(function(err,result) {
        callback(); // so what! Could not care about errors
      });
    },


    // Still processed the whole batch
    function(callback) {
      Test.find().exec(function(err,docs) {
        console.log(docs)
        callback(err);
      });
    }
  ],
  function(err) {
    if (err) throw err;
    mongoose.disconnect();
  }
);

Note that the "changed action" in current drivers is that the result response on .execute() will return an error object to be thrown, where previous releases did not do so with "Un-ordered" operations.

This makes it imperative that your code never relies on the err returned alone, and you should be inpspeting the returned result instead for the full classification of errors.

Nonetheless, when unordered then the batch continues until the end, no matter how many errors occur. Things that are not an error will be committed as normal.

This really comes down to "is sequence important". If so, then you need "Ordered" operations and you can only avoid duplicate keys by using "upserts". Otherwise use "unordered", but be aware of the error returns and what they actually mean.

Also, when using .collection to get the underlying collection object from the base driver to enable "Bulk" operations, then always be sure that either "some" mongoose method has always been called first.

Without that, there is no guaranteed connection to the database with the native driver methods as it is handled for the mongoose methods, so the operation will fail due to no connection.

The alternate to "firing" a mongoose method first, is to wrap your app logic in an event listener for the connection:

mongoose.connection.on("open",function(err) {
    // app logic in here
})

MongoDB- Insert if it doesn't exist, else skip, As has already been said, "insert if it doesn't already exist" can be achieved by using the update command with the upsert option set to true. Here's how to do that with the 3. MongoDB- Insert if it doesn't exist, else skip. Ask Question Asked 4 years, 11 months ago. Active 5 months ago. Viewed 25k times 24. 3. Is it possible to insert in

As has already been said, "insert if it doesn't already exist" can be achieved by using the update command with the upsert option set to true. Here's how to do that with the 3.x node.js driver:

let ops = [];
ops.push({ updateOne: { filter: {key:"value1"}, update: {} }, { upsert:true } });
ops.push({ updateOne: { filter: {key:"value2"}, update: { $set:{/*...*/} } }, { upsert:true } });
ops.push({ updateOne: { filter: {key:"value3"}, update: { { $setOnInsert:{/*...*/} } } }, { upsert:true } });
// < add more ops here >
await db.collection("my-collection").bulkWrite(ops, {ordered:false});

If the filter returns zero results, a new document will be created using the filter conditions and the $set updates (if any). If you use $setOnInsert, then the updates are only applied to new docs.

Posting this example because it would have been handy for my situation. More info in the docs for db.collection.bulkWrite.

Insert records in MongoDB collection if it does not exist?, You can use update() function to insert records in MongoDB if it does not exist. To understand the concept, let us create a collection with the� For corresponding MongoDB driver API, refer to your specific MongoDB driver documentation instead. Inserts a document or documents into a collection. The insert() method has the following syntax:

Use setOnInsert

db.collection('collection').updateOne(
     { _id: data._id },
    { $setOnInsert: { ...data } },
    { upsert: true },
  )

How to implement 'insert if not exists' in Mongo without a unique , I have not tested this so sorry if it doesn't work, however a simple 'Update' with a more elaborated search query (more than 1 field being checked), should do the� Home » Nodejs » MongoDB- Insert if it doesn't exist, else skip. MongoDB- Insert if it doesn't exist, else skip . Posted by: admin December 14, 2017 Leave a comment.

mongodb: insert if not exists, Every day I receive a stock of documents an update What I want to do is insert each item that does not mongodb: insert if not exists I am using the Python driver (pymongo). It will insert if the key doesn't exist and will update if it does. To insert data into MongoDB collection, you need to use MongoDB's insert() or save() method. Here mycol is our collection name, as created in the previous chapter. If the collection doesn't exist in the database, then MongoDB will create this collection and then insert a document into it. In the

db.collection.insertOne() — MongoDB Manual, Most drivers create an ObjectId and insert the _id field, but the mongod will create and populate the _id if the driver or application does not. If the document� You can use update() function to insert records in MongoDB if it does not exist. To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −

$setOnInsert — MongoDB Manual, If the update operation does not result in an insert, $setOnInsert does nothing. You can specify the upsert option for either the db.collection.update() or db. Since I get this list based on the user's coordinates, it's possible the API will return restaurants that are already in my database. To prevent duplicates, I check if the restaurant ID provided by yelp already exists in the database. If it's already in my database, it won't insert that restaurant. I'm using a MongoDB database.

Comments
  • Read "upsert". Since that is how MongoDB does this. There is .upsert() as the required modifier for bulk operations. Also $setOnInsert will only apply changes when a new document is "inserted" and nothing otherwise if the only operations are within that block.