Fix migration script not being able to run if it fails midway (#16312)

* Fix migration script not being able to run if it fails midway

* Fix old migration script

* Fix old migration script

* Refactor CorruptionError
This commit is contained in:
Claire 2021-06-02 19:15:17 +02:00
parent 31d9aa8ed0
commit 1b32c001bc
3 changed files with 27 additions and 12 deletions

View file

@ -15,7 +15,13 @@ class AddCaseInsensitiveIndexToTags < ActiveRecord::Migration[5.2]
Tag.where(id: redundant_tag_ids).in_batches.delete_all
end
safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower ON tags (lower(name))' }
begin
safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower ON tags (lower(name))' }
rescue ActiveRecord::StatementInvalid
remove_index :tags, name: 'index_tags_on_name_lower'
raise
end
remove_index :tags, name: 'index_tags_on_name'
remove_index :tags, name: 'hashtag_search_index'
end

View file

@ -1,16 +1,10 @@
require Rails.root.join('lib', 'mastodon', 'migration_helpers')
class AddFixedLowercaseIndexToAccounts < ActiveRecord::Migration[5.2]
include Mastodon::MigrationHelpers
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'
@ -21,7 +15,8 @@ class AddFixedLowercaseIndexToAccounts < ActiveRecord::Migration[5.2]
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'
remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
raise CorruptionError
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')

View file

@ -41,6 +41,20 @@
module Mastodon
module MigrationHelpers
class CorruptionError < StandardError
def initialize(message = nil)
super(message.presence || 'Migration failed because of index corruption, see https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/#fixing')
end
def cause
nil
end
def backtrace
[]
end
end
# Stub for Database.postgresql? from GitLab
def self.postgresql?
ActiveRecord::Base.configurations[Rails.env]['adapter'].casecmp('postgresql').zero?