How to Order Laravel Hackathons by Participant Count?

Laravel: Ordering by Relationship Count

In this case, you want to find hackathons sorted based on the count of participants associated with each. The provided table structure and model definitions give a clear relational schema.

The first attempt at obtaining the result, as mentioned in the question, contained a few flaws. Firstly, fetching the count of related models using find is not recommended as it eagerly loads the relationship, which can be inefficient for large datasets. Secondly, $this->id referenced within the query is incorrect, as it refers to the model instance used to make the query, not the hackathon's ID.

To achieve the desired ordering, the following approach using Laravel 5.3's eager loading and named relationships can be employed:

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

By using withCount, the count of related participants is eagerly loaded into the query, efficiently obtaining the count without additional database queries. The orderBy clause then sorts the results in descending order based on the participants_count attribute, effectively providing the most popular hackathons based on the number of participants.

The above is the detailed content of How to Order Laravel Hackathons by Participant Count?. For more information, please follow other related articles on the PHP Chinese website!