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# frozen_string_literal: true
# rubocop:disable Style/Documentation
module Gitlab
module BackgroundMigration
class ScheduleDiffFilesDeletion
class MergeRequestDiff < ActiveRecord::Base
self.table_name = 'merge_request_diffs'
belongs_to :merge_request
include EachBatch
end
DIFF_BATCH_SIZE = 5_000
INTERVAL = 5.minutes
MIGRATION = 'DeleteDiffFiles'
def perform
diffs = MergeRequestDiff
.from("(#{diffs_collection.to_sql}) merge_request_diffs")
.where('merge_request_diffs.id != merge_request_diffs.latest_merge_request_diff_id')
.select(:id)
diffs.each_batch(of: DIFF_BATCH_SIZE) do |relation, index|
ids = relation.pluck(:id)
BackgroundMigrationWorker.perform_in(index * INTERVAL, MIGRATION, [ids])
end
end
private
def diffs_collection
MergeRequestDiff
.joins(:merge_request)
.where("merge_requests.state = 'merged'")
.where('merge_requests.latest_merge_request_diff_id IS NOT NULL')
.where("merge_request_diffs.state NOT IN ('without_files', 'empty')")
.select('merge_requests.latest_merge_request_diff_id, merge_request_diffs.id')
end
end
end
end
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