How to Order Laravel Query Results by Related Model Count?

OrderBy Relationship Count in Laravel

In Laravel, you may encounter situations where you need to order query results based on the count of related models. One such scenario involves retrieving the most popular hackathons based on the number of participants associated with each hackathon.

To achieve this, you can leverage the withCount() method in conjunction with orderBy(). The following demonstrates how:

$hackathons = Hackathon::withCount('participants')
    ->orderBy('participants_count', 'desc')
    ->paginate(10);

In this example, we begin by obtaining a collection of hackathons and eagerly loading the count of participating users using withCount('participants'). We then use orderBy('participants_count', 'desc') to sort the results in descending order based on the participant count. Finally, we paginate the results into groups of 10 for display.

This approach efficiently retrieves the most popular hackathons and provides the desired ordering of results. It eliminates the need for complex manual calculations or additional queries to determine the participant count for each hackathon.

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