ids

# File activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb, line 21
        def ids
          case value
          when Relation
            value.select_values.empty? ? value.select(primary_key) : value
          when Array
            value.map { |v| convert_to_id(v) }
          else
            convert_to_id(value)
          end
        end