db/migrate/20200318163148_add_index_on_external_key_to_issues_table.rb


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# frozen_string_literal: true

class AddIndexOnExternalKeyToIssuesTable < ActiveRecord::Migration[6.0]
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  disable_ddl_transaction!

  def up
    add_concurrent_index(:issues, [:project_id, :external_key], unique: true, where: 'external_key IS NOT NULL')
  end

  def down
    remove_concurrent_index(:issues, [:project_id, :external_key])
  end
end