How to Order Laravel Relationships by Associated Model Count?

Laravel: Ordering Relationships by Associated Model Count

In Laravel, you may encounter the need to order records based on the count of related models. This technique is particularly useful for ranking or identifying the most popular items in your database.

Let's consider the example provided in the question, where you want to retrieve the most popular hackathons based on the number of participants associated with them. To achieve this, we can leverage the withCount() and orderBy() methods of Laravel's Eloquent ORM.

The withCount() method adds a dynamic count to the base query, allowing you to include the count of related models directly in the main query. In your case, this would be:

$hackathons = Hackathon::withCount('participants');

Once you have the count included in the base query, you can use the orderBy() method to sort the records based on the count:

$hackathons = $hackathons->orderBy('participants_count', 'desc');

Finally, you can use pagination to display the results, as shown in the solution provided in the response:

$hackathons = $hackathons->paginate(10);

This approach ensures that the hackathons are ordered based on the count of participants, allowing you to retrieve the most popular hackathons efficiently.

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