ActiveRecordでのpluckは積極的に使うべきなのでは

def pluck(*column_names)
      column_names.map! do |column_name|
        if column_name.is_a?(Symbol) && attribute_alias?(column_name)
          attribute_alias(column_name)
        else
          column_name.to_s
        end
      end

      if has_include?(column_names.first)
        construct_relation_for_association_calculations.pluck(*column_names)
      else
        relation = spawn
        relation.select_values = column_names.map { |cn|
          columns_hash.key?(cn) ? arel_table[cn] : cn
        }
        result = klass.connection.select_all(relation.arel, nil, bound_attributes)
        result.cast_values(klass.attribute_types)
      end
    end