class ActiveFedora::Associations::SingularAssociation

def reader(force_reload = false)

Implements the reader method, e.g. foo.bar for Foo.has_one :bar 
def reader(force_reload = false)
  if force_reload
    raise NotImplementedError, "Need to define the uncached method" #TODO
    klass.uncached { reload }
  elsif !loaded? || stale_target?
    reload
  end
  target
end