Fix old migration script not being able to run if it fails midway (#15361)
* Fix old migration script not being able to run if it fails midway Improve the robustness of a migration script likely to fail because of database corruption so it can run again once database corruptions are fixed. * Display a specific error message in case of index corruption Co-authored-by: Eugen Rochko <eugen@zeonfederated.com> Co-authored-by: Claire <claire.github-309c@sitedethib.com>remotes/1727458204337373841/tmp_refs/heads/signup-info-prompt
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class AddFixedLowercaseIndexToAccounts < ActiveRecord::Migration[5.2]
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disable_ddl_transaction!
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class CorruptionError < StandardError
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def cause
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nil
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end
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def backtrace
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[]
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end
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end
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def up
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rename_index :accounts, 'index_accounts_on_username_and_domain_lower', 'old_index_accounts_on_username_and_domain_lower' unless index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower')
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add_index :accounts, "lower (username), COALESCE(lower(domain), '')", name: 'index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
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remove_index :accounts, name: 'old_index_accounts_on_username_and_domain_lower'
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if index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower') && index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
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remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
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elsif index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
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rename_index :accounts, 'index_accounts_on_username_and_domain_lower', 'old_index_accounts_on_username_and_domain_lower'
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end
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begin
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add_index :accounts, "lower (username), COALESCE(lower(domain), '')", name: 'index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
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rescue ActiveRecord::RecordNotUnique
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raise CorruptionError, 'Migration failed because of index corruption, see https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/#fixing'
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end
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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')
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end
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def down
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