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