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# frozen_string_literal: true
module Gitlab
module BackgroundMigration
# This background migration creates records on merge_request_assignees according
# to the given merge request IDs range. A _single_ INSERT is issued for the given range.
# This is required for supporting multiple assignees on merge requests.
class PopulateMergeRequestAssigneesTable
def perform(from_id, to_id)
select_sql =
MergeRequest
.where(merge_request_assignees_not_exists_clause)
.where(id: from_id..to_id)
.where('assignee_id IS NOT NULL')
.select(:id, :assignee_id)
.to_sql
execute("INSERT INTO merge_request_assignees (merge_request_id, user_id) #{select_sql}")
end
private
def merge_request_assignees_not_exists_clause
<<~SQL
NOT EXISTS (SELECT 1 FROM merge_request_assignees
WHERE merge_request_assignees.merge_request_id = merge_requests.id)
SQL
end
def execute(sql)
@connection ||= ActiveRecord::Base.connection
@connection.execute(sql)
end
end
end
end
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