23 lines
1 KiB
Ruby
23 lines
1 KiB
Ruby
class Cron::PurgeUnattachedBlobsJob < Cron::CronJob
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self.schedule_expression = "every day at 00:30"
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def perform
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# .in_batches { _1.each... } is more efficient in this case that in_batches.each_record or find_each
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# because it plucks only ids in a preliminary query, then load records with selected columns in batches by ids.
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# This is faster than other batch strategies, which load at once selected columns with an ORDER BY in the same query, triggering timeouts.
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#
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# .where(created_at: 1.week.ago..1.day.ago) to limit the number of records to be joined
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# to the attachments table because of the unattached scope. Otherwise, it is triggering timeouts.
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#
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# the creation of an index on created_at does not seem required yet.
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#
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# caveats: the job needs to be run at least once a week to avoid missing blobs
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ActiveStorage::Blob
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.where(created_at: 1.week.ago..1.day.ago)
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.unattached
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.select(:id, :service_name)
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.in_batches do |relation|
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relation.each(&:purge_later)
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end
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end
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end
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