123 lines
4.6 KiB
Ruby
123 lines
4.6 KiB
Ruby
class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
|
|
class Account < ApplicationRecord
|
|
# Dummy class, to make migration possible across version changes
|
|
has_one :user, inverse_of: :account
|
|
|
|
def local?
|
|
domain.nil?
|
|
end
|
|
|
|
def acct
|
|
local? ? username : "#{username}@#{domain}"
|
|
end
|
|
end
|
|
|
|
class StreamEntry < ApplicationRecord
|
|
# Dummy class, to make migration possible across version changes
|
|
belongs_to :account, inverse_of: :stream_entries
|
|
end
|
|
|
|
class Status < ApplicationRecord
|
|
# Dummy class, to make migration possible across version changes
|
|
belongs_to :account
|
|
end
|
|
|
|
class Mention < ApplicationRecord
|
|
# Dummy class, to make migration possible across version changes
|
|
belongs_to :account
|
|
end
|
|
|
|
class StatusPin < ApplicationRecord
|
|
# Dummy class, to make migration possible across version changes
|
|
belongs_to :account
|
|
end
|
|
|
|
disable_ddl_transaction!
|
|
|
|
def up
|
|
if $stdout.isatty
|
|
say ''
|
|
say 'WARNING: This migration may take a *long* time for large instances'
|
|
say 'It will *not* lock tables for any significant time, but it may run'
|
|
say 'for a very long time. We will pause for 10 seconds to allow you to'
|
|
say 'interrupt this migration if you are not ready.'
|
|
say ''
|
|
say 'This migration will irreversibly delete user accounts with duplicate'
|
|
say 'usernames. You may use the `rake mastodon:maintenance:find_duplicate_usernames`'
|
|
say 'task to manually deal with such accounts before running this migration.'
|
|
|
|
10.downto(1) do |i|
|
|
say "Continuing in #{i} second#{i == 1 ? '' : 's'}...", true
|
|
sleep 1
|
|
end
|
|
end
|
|
|
|
duplicates = Account.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM accounts GROUP BY lower(username), lower(domain) HAVING count(*) > 1').to_ary
|
|
|
|
duplicates.each do |row|
|
|
deduplicate_account!(row['ids'].split(','))
|
|
end
|
|
|
|
remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower' if index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
|
|
safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_accounts_on_username_and_domain_lower ON accounts (lower(username), lower(domain))' }
|
|
remove_index :accounts, name: 'index_accounts_on_username_and_domain' if index_name_exists?(:accounts, 'index_accounts_on_username_and_domain')
|
|
end
|
|
|
|
def down
|
|
raise ActiveRecord::IrreversibleMigration
|
|
end
|
|
|
|
private
|
|
|
|
def deduplicate_account!(account_ids)
|
|
accounts = Account.where(id: account_ids).to_a
|
|
accounts = accounts.first.local? ? accounts.sort_by(&:created_at) : accounts.sort_by(&:updated_at).reverse
|
|
reference_account = accounts.shift
|
|
|
|
say_with_time "Deduplicating @#{reference_account.acct} (#{accounts.size} duplicates)..." do
|
|
accounts.each do |other_account|
|
|
if other_account.public_key == reference_account.public_key
|
|
# The accounts definitely point to the same resource, so
|
|
# it's safe to re-attribute content and relationships
|
|
merge_accounts!(reference_account, other_account)
|
|
elsif other_account.local?
|
|
# Since domain is in the GROUP BY clause, both accounts
|
|
# are always either going to be local or not local, so only
|
|
# one check is needed. Since we cannot support two users with
|
|
# the same username locally, one has to go. 😢
|
|
other_account.user&.destroy
|
|
end
|
|
|
|
other_account.destroy
|
|
end
|
|
end
|
|
end
|
|
|
|
def merge_accounts!(main_account, duplicate_account)
|
|
[Status, Mention, StatusPin, StreamEntry].each do |klass|
|
|
klass.where(account_id: duplicate_account.id).in_batches.update_all(account_id: main_account.id)
|
|
end
|
|
|
|
# Since it's the same remote resource, the remote resource likely
|
|
# already believes we are following/blocking, so it's safe to
|
|
# re-attribute the relationships too. However, during the presence
|
|
# of the index bug users could have *also* followed the reference
|
|
# account already, therefore mass update will not work and we need
|
|
# to check for (and skip past) uniqueness errors
|
|
[Favourite, Follow, FollowRequest, Block, Mute].each do |klass|
|
|
klass.where(account_id: duplicate_account.id).find_each do |record|
|
|
record.update_attribute(:account_id, main_account.id)
|
|
rescue ActiveRecord::RecordNotUnique
|
|
next
|
|
end
|
|
end
|
|
|
|
[Follow, FollowRequest, Block, Mute].each do |klass|
|
|
klass.where(target_account_id: duplicate_account.id).find_each do |record|
|
|
record.update_attribute(:target_account_id, main_account.id)
|
|
rescue ActiveRecord::RecordNotUnique
|
|
next
|
|
end
|
|
end
|
|
end
|
|
end
|