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# frozen_string_literal: true
module Gitlab
module BackgroundMigration
# Class that will populate the upvotes_count field
# for each issue
class BackfillUpvotesCountOnIssues
BATCH_SIZE = 1_000
def perform(start_id, stop_id)
(start_id..stop_id).step(BATCH_SIZE).each do |offset|
update_issue_upvotes_count(offset, offset + BATCH_SIZE)
end
end
private
def execute(sql)
@connection ||= ::ActiveRecord::Base.connection
@connection.execute(sql)
end
def update_issue_upvotes_count(batch_start, batch_stop)
execute(<<~SQL)
UPDATE issues
SET upvotes_count = sub_q.count_all
FROM (
SELECT COUNT(*) AS count_all, e.awardable_id AS issue_id
FROM award_emoji AS e
WHERE e.name = 'thumbsup' AND
e.awardable_type = 'Issue' AND
e.awardable_id BETWEEN #{batch_start} AND #{batch_stop}
GROUP BY issue_id
) AS sub_q
WHERE sub_q.issue_id = issues.id;
SQL
end
end
end
end
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