cbmi/avocado — pull request #239 by bruth (2014-10-07 12:27:21+00:00)
Title: Replace hard reference to value_field_name

The `value_field` property returns the field relative to the model
which, in the case of a Lexicon, is the primary key, not the local
foreign key field.

Fix #238

Signed-off-by: Byron Ruth