projecthydra/active_fedora — pull request #649 by jcoyne (2014-12-17 02:32:49+00:00)
Title: Raise an error if data could be lost from singularizing a list

When a property is set to `multiple: false` and we find more than one
statement for the predicate, then raise an
ActiveFedora::ConstraintError.

This should help prevent users from losing data that is not written using
ActiveFedora.