Signup error: PG::UniqueViolation (ERROR: duplicate key value violates unique constraint

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New users started reporting about this error:

PG::UniqueViolation (ERROR: duplicate key value violates unique constraint "idx_category_users_category_id_user_id" DETAIL: Key (category_id, user_id)=(55, 1691) already exists. ) app/models/user.rb

In details:

Message (2 copies reported)

PG::UniqueViolation (ERROR:  duplicate key value violates unique constraint "idx_category_users_category_id_user_id"
DETAIL:  Key (category_id, user_id)=(55, 1691) already exists.
)
app/models/user.rb:1499:in `set_default_categories_preferences'
app/controllers/users_controller.rb:629:in `create'
app/controllers/application_controller.rb:358:in `block in with_resolved_locale'
app/controllers/application_controller.rb:358:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:68:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:354:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
lib/middleware/enforce_hostname.rb:22:in `call'
lib/middleware/request_tracker.rb:176:in `call'

Backtrace

rack-mini-profiler (2.2.0) lib/patches/db/pg.rb:110:in `exec'
rack-mini-profiler (2.2.0) lib/patches/db/pg.rb:110:in `async_exec'
mini_sql (0.3) lib/mini_sql/postgres/connection.rb:201:in `run'
mini_sql (0.3) lib/mini_sql/postgres/connection.rb:173:in `exec'
app/models/user.rb:1499:in `set_default_categories_preferences'
activesupport (6.0.3.3) lib/active_support/callbacks.rb:428:in `block in make_lambda'
activesupport (6.0.3.3) lib/active_support/callbacks.rb:238:in `block in halting_and_conditional'
activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `block in invoke_after'
activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `each'
activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `invoke_after'

Env
rack-mini-profiler (2.2.0) lib/patches/db/pg.rb:110:in `exec'

rack-mini-profiler (2.2.0) lib/patches/db/pg.rb:110:in `async_exec'

mini_sql (0.3) lib/mini_sql/postgres/connection.rb:201:in `run'

mini_sql (0.3) lib/mini_sql/postgres/connection.rb:173:in `exec'

app/models/user.rb:1499:in `set_default_categories_preferences'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:428:in `block in make_lambda'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:238:in `block in halting_and_conditional'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `block in invoke_after'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `each'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:517:in `invoke_after'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:136:in `run_callbacks'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:825:in `_run_create_callbacks'

activerecord (6.0.3.3) lib/active_record/callbacks.rb:331:in `_create_record'

activerecord (6.0.3.3) lib/active_record/timestamp.rb:110:in `_create_record'

activerecord (6.0.3.3) lib/active_record/persistence.rb:905:in `create_or_update'

activerecord (6.0.3.3) lib/active_record/callbacks.rb:327:in `block in create_or_update'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:135:in `run_callbacks'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:825:in `_run_save_callbacks'

activerecord (6.0.3.3) lib/active_record/callbacks.rb:327:in `create_or_update'

activerecord (6.0.3.3) lib/active_record/timestamp.rb:128:in `create_or_update'

activerecord (6.0.3.3) lib/active_record/persistence.rb:470:in `save'

activerecord (6.0.3.3) lib/active_record/validations.rb:47:in `save'

activerecord (6.0.3.3) lib/active_record/transactions.rb:314:in `block in save'

activerecord (6.0.3.3) lib/active_record/transactions.rb:375:in `block in with_transaction_returning_status'

activerecord (6.0.3.3) lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `block in transaction'

activerecord (6.0.3.3) lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'

activesupport (6.0.3.3) lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'

activesupport (6.0.3.3) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'

activesupport (6.0.3.3) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'

activesupport (6.0.3.3) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'

activesupport (6.0.3.3) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'

activerecord (6.0.3.3) lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'

activerecord (6.0.3.3) lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction'

activerecord (6.0.3.3) lib/active_record/transactions.rb:212:in `transaction'

activerecord (6.0.3.3) lib/active_record/transactions.rb:366:in `with_transaction_returning_status'

activerecord (6.0.3.3) lib/active_record/transactions.rb:314:in `save'

activerecord (6.0.3.3) lib/active_record/suppressor.rb:44:in `save'

app/controllers/users_controller.rb:629:in `create'

actionpack (6.0.3.3) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'

actionpack (6.0.3.3) lib/abstract_controller/base.rb:195:in `process_action'

actionpack (6.0.3.3) lib/action_controller/metal/rendering.rb:30:in `process_action'

actionpack (6.0.3.3) lib/abstract_controller/callbacks.rb:42:in `block in process_action'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:112:in `block in run_callbacks'

app/controllers/application_controller.rb:358:in `block in with_resolved_locale'

i18n (1.8.5) lib/i18n.rb:313:in `with_locale'

app/controllers/application_controller.rb:358:in `with_resolved_locale'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:121:in `block in run_callbacks'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:139:in `run_callbacks'

actionpack (6.0.3.3) lib/abstract_controller/callbacks.rb:41:in `process_action'

actionpack (6.0.3.3) lib/action_controller/metal/rescue.rb:22:in `process_action'

actionpack (6.0.3.3) lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'

activesupport (6.0.3.3) lib/active_support/notifications.rb:180:in `block in instrument'

activesupport (6.0.3.3) lib/active_support/notifications/instrumenter.rb:24:in `instrument'

activesupport (6.0.3.3) lib/active_support/notifications.rb:180:in `instrument'

actionpack (6.0.3.3) lib/action_controller/metal/instrumentation.rb:32:in `process_action'

actionpack (6.0.3.3) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'

activerecord (6.0.3.3) lib/active_record/railties/controller_runtime.rb:27:in `process_action'

actionpack (6.0.3.3) lib/abstract_controller/base.rb:136:in `process'

actionview (6.0.3.3) lib/action_view/rendering.rb:39:in `process'

rack-mini-profiler (2.2.0) lib/mini_profiler/profiling_methods.rb:85:in `block in profile_method'

actionpack (6.0.3.3) lib/action_controller/metal.rb:190:in `dispatch'

actionpack (6.0.3.3) lib/action_controller/metal.rb:254:in `dispatch'

actionpack (6.0.3.3) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'

actionpack (6.0.3.3) lib/action_dispatch/routing/route_set.rb:33:in `serve'

actionpack (6.0.3.3) lib/action_dispatch/journey/router.rb:49:in `block in serve'

actionpack (6.0.3.3) lib/action_dispatch/journey/router.rb:32:in `each'

actionpack (6.0.3.3) lib/action_dispatch/journey/router.rb:32:in `serve'

actionpack (6.0.3.3) lib/action_dispatch/routing/route_set.rb:834:in `call'

lib/middleware/omniauth_bypass_middleware.rb:68:in `call'

rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call'

rack (2.2.3) lib/rack/conditional_get.rb:40:in `call'

rack (2.2.3) lib/rack/head.rb:12:in `call'

lib/content_security_policy/middleware.rb:12:in `call'

lib/middleware/anonymous_cache.rb:354:in `call'

rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context'

rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/cookies.rb:648:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'

activesupport (6.0.3.3) lib/active_support/callbacks.rb:101:in `run_callbacks'

actionpack (6.0.3.3) lib/action_dispatch/middleware/callbacks.rb:26:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/actionable_exceptions.rb:17:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'

logster (2.9.4) lib/logster/middleware/reporter.rb:43:in `call'

railties (6.0.3.3) lib/rails/rack/logger.rb:37:in `call_app'

railties (6.0.3.3) lib/rails/rack/logger.rb:28:in `call'

config/initializers/100-quiet_logger.rb:23:in `call'

config/initializers/100-silence_logger.rb:31:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/request_id.rb:27:in `call'

lib/middleware/enforce_hostname.rb:22:in `call'

rack (2.2.3) lib/rack/method_override.rb:24:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/executor.rb:14:in `call'

rack (2.2.3) lib/rack/sendfile.rb:110:in `call'

actionpack (6.0.3.3) lib/action_dispatch/middleware/host_authorization.rb:76:in `call'

rack-mini-profiler (2.2.0) lib/mini_profiler/profiler.rb:246:in `call'

message_bus (3.3.4) lib/message_bus/rack/middleware.rb:61:in `call'

lib/middleware/request_tracker.rb:176:in `call'

railties (6.0.3.3) lib/rails/engine.rb:527:in `call'

railties (6.0.3.3) lib/rails/railtie.rb:190:in `public_send'

railties (6.0.3.3) lib/rails/railtie.rb:190:in `method_missing'

rack (2.2.3) lib/rack/urlmap.rb:74:in `block in call'

rack (2.2.3) lib/rack/urlmap.rb:58:in `each'

rack (2.2.3) lib/rack/urlmap.rb:58:in `call'

unicorn (5.7.0) lib/unicorn/http_server.rb:632:in `process_client'

unicorn (5.7.0) lib/unicorn/http_server.rb:728:in `worker_loop'

unicorn (5.7.0) lib/unicorn/http_server.rb:548:in `spawn_missing_workers'

unicorn (5.7.0) lib/unicorn/http_server.rb:144:in `start'

unicorn (5.7.0) bin/unicorn:128:in `<top (required)>'

vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `load'

vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `<main>'

I’m on the latest version of Discourse.

Please, help me to fix it.

Looks like your automatic watching groups have a duplicate in them. Not sure how this is possible, but can you try resetting the site setting for auto watching ?

3 Likes

Dear Sam, you are great!

I caused this problem myself. I set a default watch category for users with Trust_level_0. This created a problem and signups failed. So I deleted the watched category for this group and now signups are working.

3 Likes

I did the same and facing the same problem. New registrations are not possible.

But are we not using the feature as intended? I want new users instantly watch a certain category.
How can I realize that?

Nope, I didn’t come out how to do it. Maybe it’s possible with groups? Add new users to a specific group automatically by default and set this group to watch some tag or category.

That’s strange to me that we can’t do it with Trust levels.

Let me know if you could do it with a group.