# File lib/mongoid/relations/bindings/referenced/many.rb, line 39
          def unbind_one(doc)
            unless _binding?
              _binding do
                doc.you_must(metadata.foreign_key_setter, nil)
                if metadata.type
                  doc.you_must(metadata.type_setter, nil)
                end
                doc.send(metadata.inverse_setter, nil)
              end
            end
          end