# Rake task for merging users
**URL:** https://meta.discourse.org/t/rake-task-for-merging-users/89086
**Category:** Announcements
**Tags:** new-feature, merge-user
**Created:** [March 1, 2018, 12:56pm UTC](https://meta.discourse.org/t/rake-task-for-merging-users/89086 "2018-03-01T12:56:29Z")
**Posts on this page:** 3
**Page:** 4
### Author:  [@pokapow](https://meta.discourse.org/u/pokapow)
#### Post date: [January 28, 2022, 12:58am UTC](https://meta.discourse.org/t/rake-task-for-merging-users/89086/63 "2022-01-28T00:58:30Z")
> [@yahyagenc](#):
>
> I got this error?
Same problem here with Discourse 2.8.0.beta11 :
```plaintext
$ rake users:merge['matt','Mateo'] --trace
** Invoke users:merge (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute users:merge
rake aborted!
ArgumentError: ArgumentError
/var/www/discourse/app/services/post_owner_changer.rb:12:in `initialize'
/var/www/discourse/app/services/user_merger.rb:71:in `new'
/var/www/discourse/app/services/user_merger.rb:71:in `change_post_owner'
/var/www/discourse/app/services/user_merger.rb:59:in `block in move_posts'
/var/www/discourse/app/services/user_merger.rb:57:in `each'
/var/www/discourse/app/services/user_merger.rb:57:in `move_posts'
/var/www/discourse/app/services/user_merger.rb:14:in `merge!'
/var/www/discourse/lib/tasks/users.rake:50:in `block in '
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `block in execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:188:in `invoke'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:160:in `invoke_task'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:125:in `run_with_threads'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:110:in `top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:83:in `block in run'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:80:in `run'
bin/rake:13:in `'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli/exec.rb:58:in `load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli/exec.rb:58:in `kernel_load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli/exec.rb:23:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli.rb:484:in `exec'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli.rb:31:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/cli.rb:25:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/exe/bundle:48:in `block in '
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/lib/bundler/friendly_errors.rb:103:in `with_friendly_errors'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.4/exe/bundle:36:in `'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `'
Tasks: TOP => users:merge
```
* * *
```plaintext
# psql --version
psql (PostgreSQL) 13.5 (Debian 13.5-1.pgdg100+1)
```
---
### Author:  [@barto\_95](https://meta.discourse.org/u/barto_95)
#### Post date: [August 12, 2022, 3:02pm UTC](https://meta.discourse.org/t/rake-task-for-merging-users/89086/64 "2022-08-12T15:02:17Z")
Hi,
I test to merge two user
when I test a command: rake
I ave this error:
```plaintext
** Invoke users:merge (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute users:merge
rake aborted!
ArgumentError: topic
/var/www/discourse/app/services/post_owner_changer.rb:13:in `block in initialize'
/var/www/discourse/app/services/post_owner_changer.rb:12:in `each'
/var/www/discourse/app/services/post_owner_changer.rb:12:in `initialize'
/var/www/discourse/app/services/user_merger.rb:71:in `new'
/var/www/discourse/app/services/user_merger.rb:71:in `change_post_owner'
/var/www/discourse/app/services/user_merger.rb:59:in `block in move_posts'
/var/www/discourse/app/services/user_merger.rb:57:in `each'
/var/www/discourse/app/services/user_merger.rb:57:in `move_posts'
/var/www/discourse/app/services/user_merger.rb:14:in `merge!'
/var/www/discourse/lib/tasks/users.rake:50:in `block in '
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `block in execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:188:in `invoke'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:160:in `invoke_task'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:125:in `run_with_threads'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:110:in `top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:83:in `block in run'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:80:in `run'
bin/rake:13:in `'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:58:in `load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:58:in `kernel_load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:23:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:483:in `exec'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:31:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:25:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/exe/bundle:48:in `block in '
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/friendly_errors.rb:120:in `with_friendly_errors'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/exe/bundle:36:in `'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `'
Tasks: TOP => users:merge
```
I d’ont know why, do you have idea for the problem ?
---
### Author:  [@tobiaseigen](https://meta.discourse.org/u/tobiaseigen)
#### Post date: [May 12, 2025, 3:19pm UTC](https://meta.discourse.org/t/rake-task-for-merging-users/89086/65 "2025-05-12T15:19:54Z")
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