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# frozen_string_literal: true
# rubocop:disable Style/Documentation
module Gitlab
module BackgroundMigration
class ReplaceBlockedByLinks
class IssueLink < ActiveRecord::Base
self.table_name = 'issue_links'
end
def perform(start_id, stop_id)
blocked_by_links = IssueLink.where(id: start_id..stop_id).where(link_type: 2)
ActiveRecord::Base.transaction do
# There could be two edge cases:
# 1) issue1 is blocked by issue2 AND issue2 blocks issue1 (type 1)
# 2) issue1 is blocked by issue2 AND issue2 is related to issue1 (type 0)
# In both cases cases we couldn't convert blocked by relation to
# `issue2 blocks issue` because there is already a link with the same
# source/target id. To avoid these conflicts, we first delete any
# "opposite" links before we update `blocked by` relation. This
# should be rare as we have a pre-create check which checks if issues
# are already linked
opposite_ids = blocked_by_links
.select('opposite_links.id')
.joins('INNER JOIN issue_links as opposite_links ON issue_links.source_id = opposite_links.target_id AND issue_links.target_id = opposite_links.source_id')
IssueLink.where(id: opposite_ids).delete_all
blocked_by_links.update_all('source_id=target_id,target_id=source_id,link_type=1')
end
end
end
end
end
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