Fix error status for invalid props Some places were raising AttributeError which results in a 405 (bad method) not a 400. Replace with UsageError or KeyError. Make rest.py::transitive_props run aginst a prop that has no transitive elements as well. So it will verify that assignedto exists even though it has no period like assignedto.name would. These should check properties in @fields and @sort. Also validate fields that are used as search params: ?assignedto=1 If the search prop was mispelled or incorrect, the search element was ignored as though it had not been specified. Now it returns a 400 to notify sender they sent an incorrect filter. Also remove unused statements that were originally for finding invalid props before we supported transitive props.