demarches-normaliennes/app/jobs/cron/purge_unattached_blobs_job.rb

16 lines
769 B
Ruby

class Cron::PurgeUnattachedBlobsJob < Cron::CronJob
self.schedule_expression = "every day at midnight"
def perform
# .in_batches { _1.each... } is more efficient in this case that in_batches.each_record or find_each
# because it plucks only ids in a preliminary query, then load records with selected columns in batches by ids.
# This is faster than other batch strategies, which load at once selected columns with an ORDER BY in the same query, triggering timeouts.
ActiveStorage::Blob.unattached.select(:id, :service_name, :created_at).in_batches do |relation|
relation.each do |blob|
return if blob.created_at > 24.hours.ago # not in where() because it's not an indexed column
blob.purge_later
end
end
end
end