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How to increment a field in mongodb?


How to increment a field in mongodb?

By : user2953527
Date : November 21 2020, 01:01 AM
I hope this helps . As the error indicates, on the client you can only perform an update with a simple _id selector. I'd recommend using a method with a slight modification to your code:
code :
Meteor.methods({
  incClicks: function(id, news) {
    check(id, String);
    check(news, Match.ObjectIncluding({link: String}));

    News.update(
      {_id: id, 'items.link': news.link},
      {$inc: {'items.$.clicks': 1}}
    );
  }
});


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How do you increment a field in mongodb using c#

How do you increment a field in mongodb using c#


By : Bristy Das
Date : March 29 2020, 07:55 AM
it fixes the issue Thought this would be pretty straight forward, but my value is remaining the same (0). , Not sure what your helper does. Here is a working snippet I use:
code :
        var query = Query.And(Query.EQ("_id", keyName));
        var sortBy = SortBy.Null;
        var update = Update.Inc("KeyValue", adjustmentAmount);
        var result = collection.FindAndModify(query, sortBy, update, true);
mongodb second id field with auto increment

mongodb second id field with auto increment


By : stevenaxe
Date : March 29 2020, 07:55 AM
should help you out MongoDB does not have an auto increment functionality.
You could solve this by keeping track the 'id' in a separate collection called 'user_sequence' and store a custom function in MongoDB to get the next value.
code :
db.users.insert({
    userid: sequenceNextValue("userid")
})
Increment field of another collection in mongodb

Increment field of another collection in mongodb


By : Kelvin
Date : March 29 2020, 07:55 AM
it should still fix some issue I think your query is not working since doc.enterprise is null On the basis of your comment.
Try to give your query like this {'name': doc.data.enterprise}
code :
function incrementEmployee(doc) {

  var deferred = q.defer();

  enterprise.findOneAndUpdate({
      'name': doc.data.enterprise
    }, {
      $inc: {
        'employees': 1
      }
    },

    function(err, num) {
      if (err) {
        deferred.reject({
          errmessage: 'couldnt incrementEmployee',
          err: err
        });
        res.send(500);
        console.log('couldnt incrementEmployee');
      } else {
        res.send(200);
        deferred.resolve({
          num: num
        });
      }
    });

  return deferred.promise;

}
auto increment a field in mongodb

auto increment a field in mongodb


By : AyushiNathiya
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Write a similar function mentioned in the docs, in python. This is what I use.
code :
def getLastUserId(self):
  if len(list(self.find())) is not 0:
    last_user = list(self.find({}).sort("user_id", -1).limit(1))
    return last_user[0]["user_id"]
  else:
    return 0
MongoDB: Set field value to 10 if less than 10, otherwise increment by one

MongoDB: Set field value to 10 if less than 10, otherwise increment by one


By : sruthi veena
Date : March 29 2020, 07:55 AM
around this issue I don't think that can be done in a single operation. However, you can create an aggregate query with the conditional statements that you then use in your update.
code :
(async () => {
    try {
        const results = await Model.aggregate([
            { '$match': { 'id': id } },
            { '$project': { 
                'counter': { 
                    '$cond': [
                        { '$lt': ['$counter', 10 ] },
                        10,
                        { '$add': ['$counter', 1 ] }
                    ] 
                }
            } }
        ]).exec();

        const data = results[0];
        const { counter } = data;

        const doc = await Model.findOneAndUpdate({ id },
            { '$set': { counter } },
            { new: true }
        ).exec();

        console.log(doc);
    } 
    catch (err) {
        console.error(err);
    }
})()
findAndModify(
    {
        'id': id,
        'counter': { '$lt': 10 } 
    }, undefined, 
    { '$inc': { 'counter': 1 } },
    callback
)
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