'MongoDB: cursor.toArray returns Promise { <pending> }

Situation

I wrote a query:

var results = db.collection('diseases').find({
  'ttl.txt': {
    $regex: data,
    $options: 'i'
  }
}).toArray();

Problem

Then I printed results to a console.

if (results.length > 0) {
  console.log(results);
}

ToArray method must return array of found documents. But this method returns me this string: Promise { <pending> }.

Question

How can I return array of found documents instead of this string?

PS

toArray: Link to the documentation

node.jsmongodbdatabase-cursor


Solution 1:[1]

In the toArray() method you write a callback function:

var results = db.collection('diseases').find({
  'ttl.txt': {
    $regex: data,
    $options: 'i'
  }
}).toArray(function(err, result) {
     if (results.length > 0) {
       console.log(results);
     }
});

Solution 2:[2]

The error is giving because it's a promise

var results = db.collection('diseases').find({
    'ttl.txt': {
            $regex: data,
            $options: 'i'
    }
}).lean().then(function (obj) {
    if (!obj) {
            return resolve('not find');
    }

    return resolve(obj);
}).catch(function (err) {


    return reject(err);
});

Solution 3:[3]

A modern approach using async/await. In this case, we want to get matching bird colors in the birds collection.

async function getBirdsByColor(color) {
    try {
        var birds = await db.collection('birds').find({
            color: color
        }).toArray()

        if(!birds || !birds.length) {
            throw('No birds with color: ' + color)
        }
        console.log('Successfully found one or more birds:', birds)
    } catch (e) {
        console.log('Bird search failure: ', e)
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Kaspar Lee
Solution 2 jcardoso
Solution 3 Ankur Soni

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