MongoDB Aggregation: How to get total records count?

🔍 MongoDB Aggregation: How to Get Total Records Count? 📊

Are you using MongoDB's powerful aggregation framework to fetch records from your database? 📋 If so, you might have come across a situation where you want to limit the number of records returned, but still need to know the total count of all matching documents. 🤔 Don't worry, we've got you covered! In this blog post, we'll show you how to get the total records count using MongoDB aggregation.

Let's take a look at the code snippet you provided as an example:

$result = $collection->aggregate(array(
  array('$match' => $document),
  array('$group' => array('_id' => '$book_id', 'date' => array('$max' => '$book_viewed'), 'views' => array('$sum' => 1))),
  array('$sort' => $sort),
  array('$skip' => $skip),
  array('$limit' => $limit),
));

From the code, we can see that the query includes a $limit parameter set to 2, which means only 2 records will be fetched. However, to get the total records count, we need to slightly modify the aggregation pipeline. Here's an easy solution for you:

$pipeline = array(
  array('$match' => $document),
  array('$group' => array('_id' => null, 'total_count' => array('$sum' => 1))),
);

$countResult = $collection->aggregate($pipeline);

$totalCount = $countResult['result'][0]['total_count'];

In the updated code, we use a new $group stage where the _id is set to null, indicating that we want to group all documents together. Then, using the $sum operator, we tally up the count of all documents as total_count. When you execute this modified query, you'll get a result that contains the total count of matching documents.

Now, you can use the totalCount variable in your application code as per your requirement. 🎉

Remember, if you ever face any issues or have further questions regarding MongoDB aggregation or any other topic, feel free to leave a comment below. We're here to help you! 💪

Don't forget to share this blog post with your fellow developers who might find it useful! Happy coding! 🚀