It seems yes. And some more:
I add this gem to my app, set orm = :mongoid
And if found the issue, that starting reproduce when Merge pull request #146 from emoreth/fix_loading_paths applied, when, for example, badge grant, I have next error.
<pre>
NameError (uninitialized constant Merit::ActiveRecord):
  /home/mayatskiy/.rvm/gems/ruby-1.9.3-p429/bundler/gems/merit-1823b845a6db/lib/merit/models/active_record/merit/activity_log.rb:2:in `<module:Merit>'
  /home/mayatskiy/.rvm/gems/ruby-1.9.3-p429/bundler/gems/merit-1823b845a6db/lib/merit/models/active_record/merit/activity_log.rb:1:in `<top (required)>'
  activesupport (3.2.13) lib/active_support/inflector/methods.rb:230:in `block in constantize'
  activesupport (3.2.13) lib/active_support/inflector/methods.rb:229:in `each'
  activesupport (3.2.13) lib/active_support/inflector/methods.rb:229:in `constantize'
  activesupport (3.2.13) lib/active_support/core_ext/string/inflections.rb:54:in `constantize'
  mongoid (3.1.6) lib/mongoid/relations/metadata.rb:630:in `klass'
  mongoid (3.1.6) lib/mongoid/relations/referenced/many.rb:565:in `criteria'
  mongoid (3.1.6) lib/mongoid/relations/metadata.rb:181:in `criteria'
  mongoid (3.1.6) lib/mongoid/relations/builders/referenced/many.rb:20:in `build'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:43:in `create_relation'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:26:in `__build__'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:116:in `block (2 levels) in get_relation'
  mongoid (3.1.6) lib/mongoid/threaded/lifecycle.rb:125:in `_loading'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:115:in `block in get_relation'
  mongoid (3.1.6) lib/mongoid/threaded/lifecycle.rb:84:in `_building'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:114:in `get_relation'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:223:in `block in getter'
  mongoid (3.1.6) lib/mongoid/validations.rb:60:in `block in read_attribute_for_validation'
  mongoid (3.1.6) lib/mongoid/relations/accessors.rb:175:in `without_autobuild'
  mongoid (3.1.6) lib/mongoid/validations.rb:60:in `read_attribute_for_validation'
  activemodel (3.2.13) lib/active_model/validator.rb:151:in `block in validate'
  activemodel (3.2.13) lib/active_model/validator.rb:150:in `each'
  activemodel (3.2.13) lib/active_model/validator.rb:150:in `validate'
  activesupport (3.2.13) lib/active_support/callbacks.rb:310:in `_callback_before_347'
  activesupport (3.2.13) lib/active_support/callbacks.rb:407:in `_run__515420121__validate__777498880__callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_validate_callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
  mongoid (3.1.6) lib/mongoid/callbacks.rb:130:in `run_callbacks'
  activemodel (3.2.13) lib/active_model/validations.rb:228:in `run_validations!'
  activemodel (3.2.13) lib/active_model/validations/callbacks.rb:53:in `block in run_validations!'
  activesupport (3.2.13) lib/active_support/callbacks.rb:403:in `_run__515420121__validation__777498880__callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_validation_callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
  mongoid (3.1.6) lib/mongoid/callbacks.rb:130:in `run_callbacks'
  activemodel (3.2.13) lib/active_model/validations/callbacks.rb:53:in `run_validations!'
  activemodel (3.2.13) lib/active_model/validations.rb:195:in `valid?'
  mongoid (3.1.6) lib/mongoid/validations.rb:84:in `valid?'
  activemodel (3.2.13) lib/active_model/validations.rb:203:in `invalid?'
  mongoid (3.1.6) lib/mongoid/persistence/insertion.rb:22:in `prepare'
  mongoid (3.1.6) lib/mongoid/persistence/operations/insert.rb:26:in `persist'
  mongoid (3.1.6) lib/mongoid/persistence.rb:56:in `insert'
  mongoid (3.1.6) lib/mongoid/persistence.rb:85:in `save'
  mongoid (3.1.6) lib/mongoid/persistence.rb:251:in `block in create'
  mongoid (3.1.6) lib/mongoid/threaded/lifecycle.rb:173:in `_creating'
  mongoid (3.1.6) lib/mongoid/persistence.rb:246:in `create'
  /home/mayatskiy/.rvm/gems/ruby-1.9.3-p429/bundler/gems/merit-1823b845a6db/lib/merit/controller_extensions.rb:18:in `log_merit_action'
  /home/mayatskiy/.rvm/gems/ruby-1.9.3-p429/bundler/gems/merit-1823b845a6db/lib/merit/controller_extensions.rb:9:in `block in included'
  activesupport (3.2.13) lib/active_support/callbacks.rb:460:in `_run__176541305__process_action__633407770__callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
  activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument'
  activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument'
  actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
  actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
  actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process'
  actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in `process'
  actionpack (3.2.13) lib/action_controller/metal.rb:203:in `dispatch'
  actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
  actionpack (3.2.13) lib/action_controller/metal.rb:246:in `block in action'
  actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `call'
  actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
  actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36:in `call'
  journey (1.0.4) lib/journey/router.rb:68:in `block in call'
  journey (1.0.4) lib/journey/router.rb:56:in `each'
  journey (1.0.4) lib/journey/router.rb:56:in `call'
  actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call'
  mongoid (3.1.6) lib/rack/mongoid/middleware/identity_map.rb:34:in `block in call'
  mongoid (3.1.6) lib/mongoid/unit_of_work.rb:39:in `unit_of_work'
  mongoid (3.1.6) lib/rack/mongoid/middleware/identity_map.rb:34:in `call'
  client_side_validations (3.2.6) lib/client_side_validations/middleware.rb:17:in `call'
  warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.3) lib/warden/manager.rb:34:in `catch'
  warden (1.2.3) lib/warden/manager.rb:34:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
  rack (1.4.5) lib/rack/etag.rb:23:in `call'
  rack (1.4.5) lib/rack/conditionalget.rb:35:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/flash.rb:242:in `call'
  rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
  rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__999754938__call__777498880__callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call'
  activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.5) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call'
  railties (3.2.13) lib/rails/engine.rb:479:in `call'
  railties (3.2.13) lib/rails/application.rb:223:in `call'
  rack (1.4.5) lib/rack/content_length.rb:14:in `call'
  railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in `call'
  thin (1.6.1) lib/thin/connection.rb:82:in `block in pre_process'
  thin (1.6.1) lib/thin/connection.rb:80:in `catch'
  thin (1.6.1) lib/thin/connection.rb:80:in `pre_process'
  thin (1.6.1) lib/thin/connection.rb:55:in `process'
  thin (1.6.1) lib/thin/connection.rb:41:in `receive_data'
  eventmachine (1.0.3) lib/eventmachine.rb:187:in `run_machine'
  eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
  thin (1.6.1) lib/thin/backends/base.rb:73:in `start'
  thin (1.6.1) lib/thin/server.rb:162:in `start'
  rack (1.4.5) lib/rack/handler/thin.rb:13:in `run'
  rack (1.4.5) lib/rack/server.rb:268:in `start'
  railties (3.2.13) lib/rails/commands/server.rb:70:in `start'
  railties (3.2.13) lib/rails/commands.rb:55:in `block in <top (required)>'
  railties (3.2.13) lib/rails/commands.rb:50:in `tap'
  railties (3.2.13) lib/rails/commands.rb:50:in `<top (required)>'
  script/rails:6:in `require'
  script/rails:6:in `<main>'
</pre>
Something with models loading is wrong. Or I missunderstanding something.