- class AddFixedLowercaseIndexToAccounts < ActiveRecord::Migration[5.2]
- disable_ddl_transaction!
-
- class CorruptionError < StandardError
- def cause
- nil
- end
-
- def backtrace
- []
- end
- end
-
- def up
- if index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower') && index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
- remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
- elsif index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
- rename_index :accounts, 'index_accounts_on_username_and_domain_lower', 'old_index_accounts_on_username_and_domain_lower'
- end
-
- begin
- add_index :accounts, "lower (username), COALESCE(lower(domain), '')", name: 'index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
- rescue ActiveRecord::RecordNotUnique
- raise CorruptionError, 'Migration failed because of index corruption, see https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/#fixing'
- end
-
- remove_index :accounts, name: 'old_index_accounts_on_username_and_domain_lower' if index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower')
- end
-
- def down
- add_index :accounts, 'lower (username), lower(domain)', name: 'old_index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
- remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
- rename_index :accounts, 'old_index_accounts_on_username_and_domain_lower', 'index_accounts_on_username_and_domain_lower'
- end
- end
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