convert_to_id

# File activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb, line 59
        def convert_to_id(value)
          return primary_key.map { |pk| value.public_send(pk) } if primary_key.is_a?(Array)

          if value.respond_to?(primary_key)
            value.public_send(primary_key)
          else
            value
          end
        end