# Merge script error when copying tags **URL:** https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360 **Category:** Bug **Created:** [September 15, 2018, 5:26pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360 "2018-09-15T17:26:16Z") **Posts on this page:** 8 **Page:** 1
### Author: ![jrgen](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jrgen/32/81165_2.png) [@jrgen](https://meta.discourse.org/u/jrgen) #### Post date: [September 15, 2018, 5:26pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/1 "2018-09-15T17:26:16Z")
Looks like a very cool and useful script, but I encountered an error when I attempted this. Any pointers to how I can resolve it? (no ruby experience) Error message: ```plaintext ... copying post_stats... copying incoming_emails... copying post_details... copying post_revisions... merging tags... Traceback (most recent call last): 4: from script/bulk_import/discourse_merger.rb:797:in `
' 3: from script/bulk_import/discourse_merger.rb:65:in `start' 2: from /home/xxxxx/discourse/script/bulk_import/base.rb:81:in `run' 1: from script/bulk_import/discourse_merger.rb:81:in `execute' script/bulk_import/discourse_merger.rb:271:in `copy_tags': undefined method `+' for nil:NilClass (NoMethodError) ``` Using the latest version of Discourse ( v2.2.0.beta2 +5 ) for both the sites. ---
### Author: ![neil](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/neil/32/102150_2.png) [@neil](https://meta.discourse.org/u/neil) #### Post date: [September 17, 2018, 1:58pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/2 "2018-09-17T13:58:11Z")
@jrgen I committed a fix for that problem: [https://github.com/discourse/discourse/commit/b9891c26417df1777b0cfc89ec41466436e10801](https://github.com/discourse/discourse/commit/b9891c26417df1777b0cfc89ec41466436e10801) ---
### Author: ![jrgen](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jrgen/32/81165_2.png) [@jrgen](https://meta.discourse.org/u/jrgen) #### Post date: [September 17, 2018, 8:25pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/3 "2018-09-17T20:25:12Z")
Thanks for that! I found a couple more errors while trying to merge two (small-ish) forums; 1. Duplicate slug: ```plaintext [...] copying user_archived_messages... copying unsubscribe_keys... copying group_mentions... copying user_histories... copying user_warnings... copying group_archived_messages... copying notifications... copying category_groups... copying group_histories... copying badge_groupings... merging badges... copying user_badges... updating foreign keys in the users table... updating category description topic ids... Traceback (most recent call last): 19: from script/bulk_import/discourse_merger.rb:798:in `
' 18: from script/bulk_import/discourse_merger.rb:66:in `start' 17: from /home/u/discourse/script/bulk_import/base.rb:81:in `run' 16: from script/bulk_import/discourse_merger.rb:88:in `execute' 15: from script/bulk_import/discourse_merger.rb:219:in `fix_category_descriptions' 14: from script/bulk_import/discourse_merger.rb:219:in `each' 13: from script/bulk_import/discourse_merger.rb:223:in `block in fix_category_descriptions' 12: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/suppressor.rb:48:in `save!' 11: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:315:in `save!' 10: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:383:in `with_transaction_returning_status' 9: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:212:in `transaction' 8: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:254:in `transaction' 7: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/transaction.rb:227:in `within_new_transaction' 6: from /home/u/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize' 5: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/transaction.rb:230:in `block in within_new_transaction' 4: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:254:in `block in transaction' 3: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:386:in `block in with_transaction_returning_status' 2: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:315:in `block in save!' 1: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/validations.rb:52:in `save!' /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/validations.rb:80:in `raise_validation_error': Validation failed: Slug is already in use (ActiveRecord::RecordInvalid) ``` 1. Double nesting of categories (not sure how this can happen): ```plaintext [...] copying notifications... copying category_groups... copying group_histories... copying badge_groupings... merging badges... copying user_badges... updating foreign keys in the users table... updating category description topic ids... Traceback (most recent call last): 19: from script/bulk_import/discourse_merger.rb:799:in `
' 18: from script/bulk_import/discourse_merger.rb:66:in `start' 17: from /home/u/discourse/script/bulk_import/base.rb:81:in `run' 16: from script/bulk_import/discourse_merger.rb:88:in `execute' 15: from script/bulk_import/discourse_merger.rb:219:in `fix_category_descriptions' 14: from script/bulk_import/discourse_merger.rb:219:in `each' 13: from script/bulk_import/discourse_merger.rb:224:in `block in fix_category_descriptions' 12: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/suppressor.rb:48:in `save!' 11: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:315:in `save!' 10: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:383:in `with_transaction_returning_status' 9: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:212:in `transaction' 8: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:254:in `transaction' 7: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/transaction.rb:227:in `within_new_transaction' 6: from /home/u/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize' 5: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/transaction.rb:230:in `block in within_new_transaction' 4: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:254:in `block in transaction' 3: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:386:in `block in with_transaction_returning_status' 2: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/transactions.rb:315:in `block in save!' 1: from /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/validations.rb:52:in `save!' /home/u/.rvm/gems/ruby-2.5.1/gems/activerecord-5.2.0/lib/active_record/validations.rb:80:in `raise_validation_error': Validation failed: You can't nest a subcategory under another (ActiveRecord::RecordInvalid) ``` ---
### Author: ![neil](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/neil/32/102150_2.png) [@neil](https://meta.discourse.org/u/neil) #### Post date: [September 19, 2018, 9:55pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/6 "2018-09-19T21:55:03Z")
> [@jrgen](#): > > Slug is already in use Do you have two categories with the same slug but different names? 🤔 I guess the script should be merging categories based on slug (`/c/:category/:subcategory`) instead of name. ---
### Author: ![jrgen](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jrgen/32/81165_2.png) [@jrgen](https://meta.discourse.org/u/jrgen) #### Post date: [September 20, 2018, 5:35am UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/8 "2018-09-20T05:35:59Z")
Yes, probably. One of the sites is imported from vbulletin, the other from a new discourse-install. Most of the categories exist in both sites, I will try to align all names and slugs before trying again ---
### Author: ![Walker\_Blackwell](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/walker_blackwell/32/119568_2.png) [@Walker\_Blackwell](https://meta.discourse.org/u/Walker_Blackwell) #### Post date: [September 25, 2018, 7:40pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/9 "2018-09-25T19:40:16Z")
This may have been what I was seeing as well (previous topic thread) as I was merging from a bbepress-to-discourse into a vb4-to-discourse. best, Walker ---
### Author: ![neil](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/neil/32/102150_2.png) [@neil](https://meta.discourse.org/u/neil) #### Post date: [September 26, 2018, 2:34am UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/10 "2018-09-26T02:34:23Z")
I made the merge tool smarter when merging/copying categories. It was only looking at category names ☹ but now looks at full category url’s to distinguish parent categories too. > ---
### Author: ![neil](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/neil/32/102150_2.png) [@neil](https://meta.discourse.org/u/neil) #### Post date: [March 29, 2019, 8:26pm UTC](https://meta.discourse.org/t/merge-script-error-when-copying-tags/97360/11 "2019-03-29T20:26:41Z")