mirror of
https://github.com/funamitech/mastodon
synced 2024-12-16 07:38:27 +09:00
33 lines
1.1 KiB
Ruby
33 lines
1.1 KiB
Ruby
class StatusIdsToTimestampIds < ActiveRecord::Migration[5.1]
|
|
def up
|
|
# Prepare the function we will use to generate IDs.
|
|
Mastodon::Snowflake.define_timestamp_id
|
|
|
|
# Set up the statuses.id column to use our timestamp-based IDs.
|
|
ActiveRecord::Base.connection.execute(<<~SQL)
|
|
ALTER TABLE statuses
|
|
ALTER COLUMN id
|
|
SET DEFAULT timestamp_id('statuses')
|
|
SQL
|
|
|
|
# Make sure we have a sequence to use.
|
|
Mastodon::Snowflake.ensure_id_sequences_exist
|
|
end
|
|
|
|
def down
|
|
# Revert the column to the old method of just using the sequence
|
|
# value for new IDs. Set the current ID sequence to the maximum
|
|
# existing ID, such that the next sequence will be one higher.
|
|
|
|
# We lock the table during this so that the ID won't get clobbered,
|
|
# but ID is indexed, so this should be a fast operation.
|
|
ActiveRecord::Base.connection.execute(<<~SQL)
|
|
LOCK statuses;
|
|
SELECT setval('statuses_id_seq', (SELECT MAX(id) FROM statuses));
|
|
ALTER TABLE statuses
|
|
ALTER COLUMN id
|
|
SET DEFAULT nextval('statuses_id_seq');
|
|
SQL
|
|
end
|
|
end
|