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# frozen_string_literal: true
module Gitlab
module BackgroundMigration
# Sets the MergeRequestDiff#files_count value for old rows
class SetMergeRequestDiffFilesCount
# Some historic data has a *lot* of files. Apply a sentinel to these cases
FILES_COUNT_SENTINEL = 2**15 - 1
def self.count_subquery
<<~SQL
files_count = (
SELECT LEAST(#{FILES_COUNT_SENTINEL}, count(*))
FROM merge_request_diff_files
WHERE merge_request_diff_files.merge_request_diff_id = merge_request_diffs.id
)
SQL
end
class MergeRequestDiff < ActiveRecord::Base # rubocop:disable Style/Documentation
include EachBatch
self.table_name = 'merge_request_diffs'
end
def perform(start_id, end_id)
MergeRequestDiff.where(id: start_id..end_id).each_batch do |relation|
relation.update_all(self.class.count_subquery)
end
end
end
end
end
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