unboundable?

# File activerecord/lib/active_record/relation/query_attribute.rb, line 33
      def unboundable?
        if defined?(@_unboundable)
          @_unboundable
        else
          value_for_database unless value_before_type_cast.is_a?(StatementCache::Substitute)
          @_unboundable = nil
        end
      rescue ::RangeError
        @_unboundable = type.cast(value_before_type_cast) <=> 0
      end