valid? (DataMapper::Query::Conditions::AbstractComparison)

    # File lib/dm-core/query/conditions/comparison.rb, line 217
            def valid?
              # This needs to be deferred until the last moment because the value
              # could be a reference to a Resource, that when the comparison was
              # created was invalid, but has since been saved and has it's key
              # set.
              subject.valid?(loaded_value)
            end