mastodon/db/migrate/20200622213645_media_attach...

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class MediaAttachmentIdsToTimestampIds < ActiveRecord::Migration[5.1]
def up
# Set up the media_attachments.id column to use our timestamp-based IDs.
safety_assured do
execute("ALTER TABLE media_attachments ALTER COLUMN id SET DEFAULT timestamp_id('media_attachments')")
end
# Make sure we have a sequence to use.
Mastodon::Snowflake.ensure_id_sequences_exist
end
def down
execute("LOCK media_attachments")
execute("SELECT setval('media_attachments_id_seq', (SELECT MAX(id) FROM media_attachments))")
execute("ALTER TABLE media_attachments ALTER COLUMN id SET DEFAULT nextval('media_attachments_id_seq')")
end
end