Unable to retrieve a singular data point from a set

I am currently working with a collection named notification and my goal is to retrieve a single value using the findOne() method.

 var allnotices = Notifications.findOne({eventownernumber:"2"},{sort: {noticedate: -1, limit: 1}}).noticemessage;

The desired outcome is to fetch the value where the eventownernumber equals 2, obtain the latest record, and only receive one record at a time.

Despite the fact that noticemessage is among the row fields, I am encountering an error indicating that noticemessage is undefined.

This is the schema:

{
    "_id": "tmkWCydSKZtYdrKTZ",
    "eventoriginalid": "3bXvARk6K6yhee6Hi",
    "lat": "-1.851881824302658",
    "lng": "96.987469482421875",
    "eventownernumber": "1",
    "eventownernames": "Test 1",
    "eventtitle": "ci",
    "eventtime": "08:05",
    "invited": "0",
    "eventduration": "21",
    "eventtype": "notification",
    "eventcategory": "hackathon",
    "eventstatus": "11",
    "createdAt": {
        "$date": "2016-11-02T12:38:40.378Z"
    },
    "noticedate": {
        "$date": "2016-11-02T16:50:53.394Z"
    },
    "noticenumber": "2",
    "noticenames": "Test 2",
    "noticemessage": "Test 2 has joined your event ci",
    "noticestatus": "12"
}

The question remains: Why does noticemessage appear as undefined?

javascriptmongodbmeteor

Answer №1

When using Collection.findOne(query).key, there are several reasons why it could result in an error:

  1. The query may not have a matching document, leading to undefined.key
  2. The specified key may not exist in the returned document
  3. The document might be in the database but not being published by the server or subscribed to by the client
  4. The document may be published and subscribed to, but the subscription is not yet ready for access with .ready()

To tackle this issue, many developers employ the following defensive pattern:

const oneDoc = myCollection.findOne(query);
let myVar = oneDoc && oneDoc.key;
if ( myVar ) {
  // perform the necessary action
} else {
  // handle the error appropriately
}

Answer №2

Make sure to save the number as an integer for eventownernnumber (and write it like eventOwnerNumber for better readability). You can either use input type="number" or convert the value to an integer like so:

Number(valueHere);

Everything else in your query seems fine, but you don't need a limit since you are using findOne() and finding the newest inserted document with noticedate: -1

Additionally, make sure to save the date like this in your insert():

noticeDate: new Date() // After making this change, your current query should retrieve the correct document

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