20161124111395_add_index_to_parent_id.rb 517 Bytes
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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.

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# rubocop:disable RemoveIndex
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class AddIndexToParentId < ActiveRecord::Migration[4.2]
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  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  disable_ddl_transaction!

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  def up
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    add_concurrent_index(:namespaces, [:parent_id, :id], unique: true)
  end
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  def down
    remove_index :namespaces, [:parent_id, :id] if index_exists? :namespaces, [:parent_id, :id]
  end
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end