Fix column collations and table default collation in a migration

db/migrate/20240415080757_fix_collations.rb

@@ -0,0 +1,35 @@
+# In MySQL 8.0, the default collation for utf8mb4 is changed to utf8mb4_0900_ai_ci.
+# The column collations are utf8mb4_0900_ai_ci after we ran migrations prior to this
+# on MySQL 8.0 because we did not specify collation in create_table (thus the default is used).
+# This happens on testing/development but we want to keep utf8mb4_general_ci.
+#
+# Note that running this should not affect the actual schema and data
+# unless you've ran prior migrations on MySQL 8.0.
+class FixCollations < ActiveRecord::Migration[6.1]
+  def change
+    reversible do |direction|
+      direction.up do
+        # alter column collations and default collation of every tables defined to utf8mb4_general_ci
+        execute 'ALTER TABLE barbeque_apps CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_docker_containers CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_ecs_hako_tasks CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_job_executions CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_job_queues CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_job_retries CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_retry_configs CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_slack_notifications CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE barbeque_sns_subscriptions CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        execute 'ALTER TABLE kuroko2_executions CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+
+        # barbeque_job_definitions contains a column with explicitly specified collation
+        execute 'ALTER TABLE barbeque_job_definitions DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci'
+        change_column :barbeque_job_definitions, :command, :string, collation: 'utf8mb4_general_ci'
+        change_column :barbeque_job_definitions, :description, :text, collation: 'utf8mb4_general_ci'
+      end
+
+      direction.down do
+        raise ActiveRecord::IrreversibleMigration
+      end
+    end
+  end
+end