17_3

17_3.rb

def job_reviews_count
  SizeBatchLoader.for(object[:id]).batch do |employer_ids, loader|
    # Query for all of the JobReviews for the employers we need, and only select the one column that will be used
    job_reviews = JobReview.select(:employer_id).where(employer_id: employer_ids)
    employer_ids.each do |employer_id|
      # Filter the full set of results for each employer. This is what will be passed to the sync method in the new BatchLoader we created.
      loader.call(employer_id, job_reviews.filter { |job_review| job_review.employer_id == employer_id })
    end
  end
end