我正在经历一个非常奇怪的错误，只是间歇性的。我刚刚完成了从Rails 3.0到Rails 3.2的升级。 3.0应用程序一直在Heroku的Bamboo堆栈上运行，并且在升级的同时，我也正在转向更现代的Cedar堆栈。
Heroku用于迁移的instructions说要使用PG Backups将数据从旧的Bamboo应用迁移到新的Cedar应用。
我已按照上述文件中的说明完成了所有工作。现在，我的应用主要是。我已经测试了所有功能，检查/加载了所有页面，而新的Cedar应用程序运行主要是。
以下是主要是的原因：间歇性地，应用程序将发出500错误，而不是加载几秒钟之前正在运行的页面。错误是ActiveRecord::StatementInvalid: PG::Error: ERROR: relation "users" does not exist，如果您刷新同一页几次，它就会消失，页面会加载。保持清爽，最终会再次出错。
我读过有关错误的所有内容都表示要运行rake db:migrate，但我已经在旧的Bamboo应用上完成了这项操作，然后才进行数据迁移！从3.0升级到3.2，没有涉及数据库更改。此外，如果是迁移问题，则不应加载页面。
我在下面列出了Airbrake的回溯。感谢帮助。
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1174:in `get_last_result'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1174:in `exec_cache'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:661:in `block in exec_query'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/active_record.rb:46:in `block in log_with_newrelic_instrumentation'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/method_tracer.rb:273:in `trace_execution_scoped'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/active_record.rb:43:in `log_with_newrelic_instrumentation'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:659:in `exec_query'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1256:in `select'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:18:in `select_all'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/query_cache.rb:61:in `block in select_all'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/query_cache.rb:75:in `cache_sql'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/query_cache.rb:61:in `select_all'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/querying.rb:38:in `block in find_by_sql'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/explain.rb:41:in `logging_query_plan'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/querying.rb:37:in `find_by_sql'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/method_tracer.rb:523:in `block in find_by_sql_with_trace_ActiveRecord_self_name_find_by_sql'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/method_tracer.rb:273:in `trace_execution_scoped'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/method_tracer.rb:518:in `find_by_sql_with_trace_ActiveRecord_self_name_find_by_sql'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation.rb:171:in `exec_queries'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation.rb:160:in `block in to_a'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/explain.rb:41:in `logging_query_plan'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation.rb:159:in `to_a'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:380:in `find_first'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:122:in `first'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:338:in `find_one'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:314:in `find_with_ids'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:107:in `find'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/querying.rb:5:in `find'
app/controllers/users_controller.rb:18:in `show'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/abstract_controller/base.rb:167:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/rendering.rb:10:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:425:in `_run__1799501095522236001__process_action__1043849600952898910__callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:405:in `__run_callback'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:81:in `run_callbacks'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/abstract_controller/callbacks.rb:17:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/rescue.rb:29:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications.rb:123:in `block in instrument'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications.rb:123:in `instrument'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:318:in `perform_action_with_newrelic_trace'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/abstract_controller/base.rb:121:in `process'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/abstract_controller/rendering.rb:45:in `process'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal.rb:203:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_controller/metal.rb:246:in `block in action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:73:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:36:in `call'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:68:in `block in call'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `each'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:612:in `call'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/rack/error_collector.rb:12:in `call'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/rack/agent_hooks.rb:18:in `call'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:35:in `block in call'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `catch'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/etag.rb:23:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/conditionalget.rb:25:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/head.rb:14:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/flash.rb:242:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:210:in `context'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:205:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/cookies.rb:341:in `call'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/query_cache.rb:64:in `call'
vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:405:in `_run__2580604918081661655__call__521120290706034756__callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:405:in `__run_callback'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:81:in `run_callbacks'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/sendfile.rb:102:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/rack/logger.rb:32:in `call_app'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/rack/logger.rb:16:in `block in call'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/tagged_logging.rb:22:in `tagged'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/rack/logger.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/request_id.rb:22:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/static.rb:63:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.4/lib/rack/timeout.rb:16:in `block in call'
/usr/local/lib/ruby/1.9.1/timeout.rb:58:in `timeout'
vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.4/lib/rack/timeout.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/engine.rb:479:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:223:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:552:in `process_client'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:632:in `worker_loop'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:22:in `call'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:22:in `block (4 levels) in <top (required)>'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:500:in `spawn_missing_workers'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:142:in `start'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/bin/unicorn:126:in `<top (required)>'
vendor/bundle/ruby/1.9.1/bin/unicorn:19:in `load'
vendor/bundle/ruby/1.9.1/bin/unicorn:19:in `<main>'
答案 0 :(得分：2)
好的，您在迁移之前运行了db：migrate - 但是再次执行此操作。
heroku run rake db:migrate
您也可以重新启动应用
heroku restart
应用程序是否也在开发计算机上运行？如果gemfile中没有指定gems的版本号，那么Heroku将使用最新的版本号。检查Heroku和您的开发机器是否运行相同的版本或更好地在gemfile中指定它。