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class AddForeignKeyToMergeRequests < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
include ::EachBatch
end
def up
scope = <<-SQL.strip_heredoc
head_pipeline_id IS NOT NULL
AND NOT EXISTS (
SELECT 1 FROM ci_pipelines
WHERE ci_pipelines.id = merge_requests.head_pipeline_id
)
SQL
MergeRequest.where(scope).each_batch(of: 1000) do |merge_requests|
merge_requests.update_all(head_pipeline_id: nil)
end
unless foreign_key_exists?(:merge_requests, column: :head_pipeline_id)
add_concurrent_foreign_key(:merge_requests, :ci_pipelines,
column: :head_pipeline_id, on_delete: :nullify)
end
end
def down
if foreign_key_exists?(:merge_requests, column: :head_pipeline_id)
remove_foreign_key(:merge_requests, column: :head_pipeline_id)
end
end
end
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