NUBIC/surveyor — pull request #295 by yipdw (2012-04-05 19:32:30+00:00)
Title: Load rabl for {ResponseSet,Survey}#to_json.

Without this require, it's possible for the Rabl constant to be
undefined when #to_json is invoked. The error can be replicated in
Surveyor's testbed:

~/src/surveyor/testbed $ rails c
>> rs = ResponseSet.first
# => #
>> rs.to_json
NameError: uninitialized constant Surveyor::Models::ResponseSetMethods::Rabl