When using Meteor, the function findOne may sometimes result in undefined

Question

When using Meteor, the function findOne may sometimes result in undefined

Searching for the _id in my database immediately returns undefined:

 var test = Exemple.findOne({_id: test_id});

However, using the following code retrieves all data from the collection:

var test = Exemple.find({}).fetch()

The data includes:

{ _id: '17SRlRpRSzP339E41A',
    creationIP: 'local',
    state: 
    { label: 'never connected',
    date: Wed Mar 14 2018 12:20:08 GMT+0100 (CET) },
    language: 'en',
    batch: '9zLKCkvSAyxQ4jtDG7_32018',
    creationDate: Wed Mar 14 2018 12:20:08 GMT+0100 (CET) } ]

I only need to extract the _id and store it in a variable like this:

var test = Exemple.findOne({_id: test_id});

javascript mongodb meteor

Answer 1

Answer №1

This code snippet is designed to retrieve the item from the database that has an _id matching the value of test_id:

var test_id = 'abc';
var test = Exemple.findOne({_id: test_id});

If there is no item in the database with an _id equal to the value of test_id, the result will be null.

To extract the id of a particular item, you can perform the following steps:

var test = Exemple.findOne({});
var docId = test._id;
console.log(docId);

It is important to note that this method selects a random document from the collection. If you wish to fetch a specific item, consider refining your query.

Answer 2

This code snippet is designed to retrieve the item from the database that has an _id matching the value of test_id:

var test_id = 'abc';
var test = Exemple.findOne({_id: test_id});

If there is no item in the database with an _id equal to the value of test_id, the result will be null.

To extract the id of a particular item, you can perform the following steps:

var test = Exemple.findOne({});
var docId = test._id;
console.log(docId);

It is important to note that this method selects a random document from the collection. If you wish to fetch a specific item, consider refining your query.

Answer 3

Answer №2

(async function() {
const example = await ExampleModel.findById({_id: example_id});
console.log(example)
})()

Tom highlighted the importance of awaiting promises to fulfill before proceeding.

Answer 4

(async function() {
const example = await ExampleModel.findById({_id: example_id});
console.log(example)
})()

Tom highlighted the importance of awaiting promises to fulfill before proceeding.

When using Meteor, the function findOne may sometimes result in undefined

Answer №1

Answer №2

Similar questions

Is there a way to deactivate all the checkboxes mentioned above if the "None of the above" checkbox is selected?

Unable to transfer the array from express to mongoDB

How should I proceed if I encounter an npm error stating that cb() was never called?

React is not identified as an internal or external command, application, or script file that can be executed

Mapping encryption queries for field collections in MongoDB

What is the best way to implement React Router within an if/else statement inside a function triggered by a button click?

Looking for assistance with transferring a data attribute to a form redirection

Order Data Table Using Vanilla JavaScript on the Client-Side without Utilizing External Libraries

Tips for enabling mouse functionality while utilizing PointerLockControls

What is the best way to utilize the ajax factory method in order to establish a $scoped variable?

What is causing the image to become distorted on the canvas?

Steps to trigger an action upon selecting a radio button on an HTML and CSS website

When inside a function declaration, io.socket is not defined, but it is defined outside of

Creating a query to retrieve data from a JSON string involves structuring your query to target

Loading information into MongoDB results in the error message "stack level too deep."

Executing JavaScript code remotely on an open browser tab, whether from a file or as a JavaScript expression: How does it work?

Exploring Node.js and Mongoose: A guide on traversing an array of objects to remove a specific item, followed by updating the entire document

Ways to hide the value from being shown

Exploring REGEX in pymongo

Variations in how words are organized within a sentence