get_all_versions

# File activerecord/lib/active_record/migration.rb, line 1027
      def get_all_versions(connection = Base.connection)
        ActiveSupport::Deprecation.silence do
          if connection.table_exists?(schema_migrations_table_name)
            SchemaMigration.all.map { |x| x.version.to_i }.sort
          else
            []
          end
        end
      end