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Fix null values being included in some indexes (#17711)

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* Fix null values being included in some indexes

* Update lib/mastodon/migration_helpers.rb

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Add documentation link to corruption error message

Co-authored-by: Claire <claire.github-309c@sitedethib.com>
This commit is contained in:
Eugen Rochko 2022-03-12 08:12:57 +01:00 • committed by GitHub
parent bc320d6cec
commit 75e33fd08f
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23 changed files with 354 additions and 37 deletions
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lib/mastodon/migration_helpers.rb
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@ -42,8 +42,14 @@
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')
attr_reader :index_name
def initialize(index_name)
@index_name = index_name
super "The index `#{index_name}` seems to be corrupted, it contains duplicate rows. " \
'For information on how to fix this, see our documentation: ' \
'https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/'
end
def cause
@ -802,6 +808,24 @@ module Mastodon
columns(table).find { |column| column.name == name }
end
# Update the configuration of an index by creating a new one and then
# removing the old one
def update_index(table_name, index_name, columns, **index_options)
if index_name_exists?(table_name, "#{index_name}_new") && index_name_exists?(table_name, index_name)
remove_index table_name, "#{index_name}_new"
end
begin
add_index table_name, columns, **index_options.merge(name: "#{index_name}_new", algorithm: :concurrently)
rescue ActiveRecord::RecordNotUnique
remove_index table_name, name: "#{index_name}_new"
raise CorruptionError.new(index_name)
end
remove_index table_name, name: index_name if index_name_exists?(table_name, index_name)
rename_index table_name, "#{index_name}_new", index_name
end
# This will replace the first occurrence of a string in a column with
# the replacement
# On postgresql we can use `regexp_replace` for that.