db/migrate/20180420010016_add_pipeline_build_foreign_key.rb


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class AddPipelineBuildForeignKey < ActiveRecord::Migration
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  disable_ddl_transaction!

  def up
    execute <<~SQL
      DELETE FROM ci_builds WHERE NOT EXISTS
        (SELECT true FROM ci_pipelines WHERE ci_pipelines.id = ci_builds.commit_id)
    SQL

    return if foreign_key_exists?(:ci_builds, :ci_pipelines, column: :commit_id)

    add_concurrent_foreign_key(:ci_builds, :ci_pipelines, column: :commit_id)
  end

  def down
    return unless foreign_key_exists?(:ci_builds, :ci_pipelines, column: :commit_id)

    remove_foreign_key(:ci_builds, column: :commit_id)
  end
end