forked from treehouse/mastodon
89 lines
3.6 KiB
Ruby
89 lines
3.6 KiB
Ruby
class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
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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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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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def merge_accounts!(main_account, duplicate_account)
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[Status, Favourite, Mention, StatusPin, StreamEntry].each do |klass|
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klass.where(account_id: duplicate_account.id).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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[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(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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klass.where(target_account_id: duplicate_account.id).find_each do |record|
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begin
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record.update(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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