Unable to move topic OP into another existing topic

[Freso]

I’m trying to move this topic:

Long-time lurker, first time Poster

Into this topic:

Introduction thread!

And I keep getting «There was an error moving posts into that topic.» which is not very helpful in determining why it won’t move it. Is there some kind of restriction in place to prevent moving topic OPs into other topics? Or what else might be in play here?

In the log I see NoMethodError (undefined method ``id' for nil:NilClass) /var/www/discourse/app/models/post_action.rb:317:in ``copy' (’`'s changed to ‘``’ since you apparently can’t backslash escape them.):

/var/www/discourse/app/models/post_action.rb:317:in `copy'
/var/www/discourse/app/models/post_mover.rb:96:in `create_first_post'
/var/www/discourse/app/models/post_mover.rb:77:in `block in move_each_post'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/relation/delegation.rb:46:in `each'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/relation/delegation.rb:46:in `each'
/var/www/discourse/app/models/post_mover.rb:76:in `move_each_post'
/var/www/discourse/app/models/post_mover.rb:46:in `move_posts_to'
/var/www/discourse/app/models/post_mover.rb:18:in `block in to_topic'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/transactions.rb:220:in `transaction'
/var/www/discourse/app/models/post_mover.rb:17:in `to_topic'
/var/www/discourse/app/models/topic.rb:797:in `move_posts'
/var/www/discourse/app/controllers/topics_controller.rb:518:in `merge_topic'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/abstract_controller/base.rb:198:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/rendering.rb:10:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:117:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:505:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:92:in `__run_callbacks__'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/abstract_controller/callbacks.rb:19:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/rescue.rb:29:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/notifications.rb:164:in `block in instrument'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/notifications.rb:164:in `instrument'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/abstract_controller/base.rb:137:in `process'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionview-4.2.8/lib/action_view/rendering.rb:30:in `process'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-mini-profiler-0.10.5/lib/mini_profiler/profiling_methods.rb:76:in `block in profile_method'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal.rb:196:in `dispatch'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_controller/metal.rb:237:in `block in action'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/routing/route_set.rb:43:in `serve'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/journey/router.rb:43:in `block in serve'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/journey/router.rb:30:in `each'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/journey/router.rb:30:in `serve'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/routing/route_set.rb:817:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/strategy.rb:167:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/omniauth-1.6.1/lib/omniauth/builder.rb:63:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/conditionalget.rb:38:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/head.rb:13:in `call'
/var/www/discourse/lib/middleware/anonymous_cache.rb:138:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/params_parser.rb:27:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/flash.rb:260:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/session/abstract/id.rb:225:in `context'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/session/abstract/id.rb:220:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/cookies.rb:560:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/query_cache.rb:36:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activerecord-4.2.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:88:in `__run_callbacks__'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/logster-1.2.7/lib/logster/middleware/reporter.rb:31:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/rack/logger.rb:38:in `call_app'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/rack/logger.rb:22:in `call'
/var/www/discourse/config/initializers/100-quiet_logger.rb:17:in `call_with_quiet_assets'
/var/www/discourse/config/initializers/100-silence_logger.rb:29:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/request_id.rb:21:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/methodoverride.rb:22:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/runtime.rb:18:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/sendfile.rb:113:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-mini-profiler-0.10.5/lib/mini_profiler/profiler.rb:171:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/message_bus-2.0.2/lib/message_bus/rack/middleware.rb:62:in `call'
/var/www/discourse/lib/middleware/request_tracker.rb:73:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/engine.rb:518:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/application.rb:165:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/railtie.rb:194:in `public_send'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/railties-4.2.8/lib/rails/railtie.rb:194:in `method_missing'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/urlmap.rb:66:in `block in call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/urlmap.rb:50:in `each'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/rack-1.6.8/lib/rack/urlmap.rb:50:in `call'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/lib/unicorn/http_server.rb:606:in `process_client'
/var/www/discourse/lib/scheduler/defer.rb:85:in `process_client'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/lib/unicorn/http_server.rb:702:in `worker_loop'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/lib/unicorn/http_server.rb:549:in `spawn_missing_workers'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/lib/unicorn/http_server.rb:563:in `maintain_worker_count'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/lib/unicorn/http_server.rb:293:in `join'
/var/www/discourse/vendor/bundle/ruby/2.4.0/gems/unicorn-5.3.0/bin/unicorn:126:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.4.0/bin/unicorn:22:in `load'
/var/www/discourse/vendor/bundle/ruby/2.4.0/bin/unicorn:22:in `<main>'

Which might be related?

[sam (Sam Saffron)]

It looks like a bug, but it is very very hard to debug this without a repro. Are you able to reproduce the problem in a demo post?

[codinghorror (Jeff Atwood)]

Looks like first post has to be flagged to threshold, then merged to another topic. @techAPJ can you repro locally?

[techAPJ (Arpit Jalan)]

Yes, I can repro this issue. Working on a fix now.

[techAPJ (Arpit Jalan)]

I was able to repro the exact same error when moving a first post to closed/archived topic and that is now fixed via:

https://github.com/discourse/discourse/commit/984778d3acb209297e37681137c0d8d5131e83ec

@Freso I see that the destination topic in your case was not closed/archived, but can you please try updating your instance to latest version and see if the issue is fixed for you?

[Freso]

Yes, it worked now:

Introduction thread!

Thanks a bunch!