The latest articles on DEV Community by dx0x58 (@dx0x58). https://dev.to/dx0x58 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F157073%2Ff7f41646-4a1b-4139-b2d0-d56811f71788.jpeg https://dev.to/dx0x58 en dx0x58 Sun, 05 May 2019 18:33:33 +0000 https://dev.to/dx0x58/how-to-fix-rails-activerecord-concurrentmigrationerror-1g65 https://dev.to/dx0x58/how-to-fix-rails-activerecord-concurrentmigrationerror-1g65 <p>To correct an <code>ActiveRecord::ConcurrentMigrationError</code> when trying to run Rails databases migrations, you need to:</p> <ol> <li>open <code>psql</code> </li> <li>Select advisory locks <code>SELECT pid, locktype, mode FROM pg_locks WHERE locktype = 'advisory';</code> </li> <li>Kill this scoundrels! <code>SELECT pg_terminate_backend(&lt;PID&gt;);</code> </li> </ol> rails database postgres