canvas-lms/db/migrate/20180830155131_add_context_code_index_to_submissions.rb

# frozen_string_literal: true

class AddContextCodeIndexToSubmissions < ActiveRecord::Migration[5.1]
  tag :postdeploy
  disable_ddl_transaction!

  def change
    add_index :submissions, [:user_id, :context_code], :algorithm => :concurrently
  end
end