Rails exceptions from reserved keywords

I keep bumping into exception errors that I believe are due to conflicts from reserved keywords.

For example, I have a permit model with the attribute "gross_value." When my view tries to retrieve @permit.gross_value I get the following exception error. However, when I rename the attribute to @permit.value_gross (without changing anything else) the view works fine. I've had similar issues with other attribute names.

Is my diagnosis of the reason for the exception correct? How do I know what keywords to avoid this issue?

fatal (exception reentered):

actionpack (5.0.1) lib/action_controller/metal/rescue.rb:23:in rescue in process_action'
actionpack (5.0.1) lib/action_controller/metal/rescue.rb:20:inprocess_action'
actionpack (5.0.1) lib/action_controller/metal/instrumentation.rb:32:in block in process_action'
activesupport (5.0.1) lib/active_support/notifications.rb:164:inblock in instrument'
activesupport (5.0.1) lib/active_support/notifications/instrumenter.rb:21:in instrument'
activesupport (5.0.1) lib/active_support/notifications.rb:164:ininstrument'
actionpack (5.0.1) lib/action_controller/metal/instrumentation.rb:30:in process_action'
actionpack (5.0.1) lib/action_controller/metal/params_wrapper.rb:248:inprocess_action'
activerecord (5.0.1) lib/active_record/railties/controller_runtime.rb:18:in process_action'
actionpack (5.0.1) lib/abstract_controller/base.rb:126:inprocess'
actionview (5.0.1) lib/action_view/rendering.rb:30:in process'
actionpack (5.0.1) lib/action_controller/metal.rb:190:indispatch'
actionpack (5.0.1) lib/action_controller/metal.rb:262:in dispatch'
actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:50:indispatch'
actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:32:in serve'
actionpack (5.0.1) lib/action_dispatch/journey/router.rb:39:inblock in serve'
actionpack (5.0.1) lib/action_dispatch/journey/router.rb:26:in each'
actionpack (5.0.1) lib/action_dispatch/journey/router.rb:26:inserve'
actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:725:in call'
rack (2.0.1) lib/rack/etag.rb:25:incall'
rack (2.0.1) lib/rack/conditional_get.rb:25:in call'
rack (2.0.1) lib/rack/head.rb:12:incall'
rack (2.0.1) lib/rack/session/abstract/id.rb:222:in context'
rack (2.0.1) lib/rack/session/abstract/id.rb:216:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/cookies.rb:613:in call'
activerecord (5.0.1) lib/active_record/migration.rb:553:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/callbacks.rb:38:in block in call'
activesupport (5.0.1) lib/active_support/callbacks.rb:97:inrun_callbacks'
activesupport (5.0.1) lib/active_support/callbacks.rb:750:in _run_call_callbacks'
activesupport (5.0.1) lib/active_support/callbacks.rb:90:inrun_callbacks'
actionpack (5.0.1) lib/action_dispatch/middleware/callbacks.rb:36:in call'
actionpack (5.0.1) lib/action_dispatch/middleware/executor.rb:12:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/remote_ip.rb:79:in call'
actionpack (5.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:49:incall'
web-console (3.1.1) lib/web_console/middleware.rb:131:in call_app'
web-console (3.1.1) lib/web_console/middleware.rb:28:inblock in call'
web-console (3.1.1) lib/web_console/middleware.rb:18:in catch'
web-console (3.1.1) lib/web_console/middleware.rb:18:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/show_exceptions.rb:31:in call'
railties (5.0.1) lib/rails/rack/logger.rb:36:incall_app'
railties (5.0.1) lib/rails/rack/logger.rb:24:in block in call'
activesupport (5.0.1) lib/active_support/tagged_logging.rb:69:inblock in tagged'
activesupport (5.0.1) lib/active_support/tagged_logging.rb:26:in tagged'
activesupport (5.0.1) lib/active_support/tagged_logging.rb:69:intagged'
railties (5.0.1) lib/rails/rack/logger.rb:24:in call'
sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/request_id.rb:24:in call'
rack (2.0.1) lib/rack/method_override.rb:22:incall'
rack (2.0.1) lib/rack/runtime.rb:22:in call'
activesupport (5.0.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:incall'
actionpack (5.0.1) lib/action_dispatch/middleware/executor.rb:12:in call'
actionpack (5.0.1) lib/action_dispatch/middleware/static.rb:136:incall'
rack (2.0.1) lib/rack/sendfile.rb:111:in call'
railties (5.0.1) lib/rails/engine.rb:522:incall'
puma (3.4.0) lib/puma/configuration.rb:224:in call'
puma (3.4.0) lib/puma/server.rb:569:inhandle_request'
puma (3.4.0) lib/puma/server.rb:406:in process_client'
puma (3.4.0) lib/puma/server.rb:271:inblock in run'
puma (3.4.0) lib/puma/thread_pool.rb:114:in `block in spawn_thread'

Thanks for your help!

Simon