Esme's problem.

gistfile1.rb

class XVocabulary < ActiveFedora::Base
   has_many :x_vocabulary_entries, :property => :vocabularyEntry, :inverse_of => :x_vocabulary
 end
=> #<Proc:0x007fbd056b4b20@/Users/justin/workspace/active_fedora/lib/active_fedora/associations.rb:265 (lambda)>
class XVocabularyEntry < ActiveFedora::Base
   belongs_to :x_vocabulary, :property => 'dams:vocabulary', :inverse_of => :vocabulary
end
=> #<Proc:0x007fbd056d7dc8@/Users/justin/workspace/active_fedora/lib/active_fedora/associations.rb:275 (lambda)>
 
XVocabulary.create
=> #<XVocabulary pid:"changeme:4747", >
XVocabulary.create
=> #<XVocabulary pid:"changeme:4748", >

ve = XVocabularyEntry.create(x_vocabulary_id: "changeme:4747")
=> #<XVocabularyEntry pid:"changeme:4750", >
ve.x_vocabulary_id
=> "changeme:4747"
ve.x_vocabulary_id = "changeme:4748"
=> "changeme:4748"
ve.save!
=> true

>> ve.reload
=> #<XVocabularyEntry pid:"changeme:4750", >
ve.x_vocabulary_id
=> "changeme:4748"
ve.RELS_EXT.content
=> "\n<rdf:RDF xmlns:ns0=\"info:fedora/fedora-system:def/model#\" xmlns:ns1=\"info:fedora/fedora-system:def/relations-external#dams:\" xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n  <rdf:Description rdf:about=\"info:fedora/changeme:4750\">\n    <ns0:hasModel rdf:resource=\"info:fedora/afmodel:XVocabularyEntry\"></ns0:hasModel>\n    <ns1:vocabulary rdf:resource=\"info:fedora/changeme:4748\"></ns1:vocabulary>\n  </rdf:Description>\n</rdf:RDF>\n"