Передаём Query Builder в whereIn для сокращения количества запросов
https://ashallendesign.co.uk/blog/laravel-wherein-reduce-queries
ashallendesign.co.uk
Pass a Query Builder to "whereIn" to Reduce Your DB Queries
Pass a Query Builder to "whereIn" to Reduce Your DB Queries
Learn how to reduce your database queries by passing an instance of "Illuminate\Database\Query\Builder" to the "whereIn" method of your queries.