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Q&A

Mysql return error Unknown collation: 'utf8mb4_0900_ai_ci' when run rails db:schema:load Question

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I tried to install on my free GCP VM compute but when run rails db:schema:load

return error:

-- create_table("abilities", {:options=>"ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci", :force=>:cascade})
rails aborted!
ActiveRecord::StatementInvalid: Mysql2::Error: Unknown collation: 'utf8mb4_0900_ai_ci': CREATE TABLE `abilities` (`id` bigint NOT NULL AUTO_INCREMENT PRIMARY KEY, `community_id` bigint, `name` varchar(255), `description` text, `internal_id` varchar(255), `icon` varchar(255), `post_score_threshold` decimal(10,8), `edit_score_threshold` decimal(10,8), `flag_score_threshold` decimal(10,8), `created_at` datetime NOT NULL, `updated_at` datetime NOT NULL, `summary` text,  INDEX `index_abilities_on_community_id`  (`community_id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

It was worked fine on my Mac OS, what's wrong with my ubuntu?

Maybe I need to install/activate utf8mb4_0900_ai_ci, but how to do it? I cant find any resource about install it, just suggestion to change it to utf8mb4_general_ci

My software specification:

  • Ubuntu 18.04
  • mysql 5.7.32-0ubuntu0.18.04.1-log
  • Ruby 2.6.6
  • gem 3.0.3
  • rails 5.2.4.4
  • rbenv 1.0.0
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The problem is the version of MySQL. This collation was added with MySQL 8.0 and is the new default. MySQL 5.7.32 does not have it. Since the create table statement includes it, clearly it is designed for MySQL 8.0 or above.

A big related question is whether there are any functional requirements in Codidact that need MySQL above 5.7.32. If there are, then the only practical solution is to install MySQL 8.0 or above in your system, or connect to a MySQL server elsewhere that is running 8.0 or above.

If there are no issues other than the collation, you can change all references to utf8_general_ci or another common collation. See https://stackoverflow.com/questions/57546833/how-to-take-a-dump-from-mysql-8-0-into-5-7 for a similar question.

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