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mastodon/db/migrate/20221025171544_add_index_ip...

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Ruby

# frozen_string_literal: true
class AddIndexIpBlocksOnIp < ActiveRecord::Migration[6.1]
disable_ddl_transaction!
def up
duplicates = IpBlock.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM ip_blocks GROUP BY ip HAVING count(*) > 1').to_ary
duplicates.each do |row|
IpBlock.where(id: row['ids'].split(',')[0...-1]).destroy_all
end
add_index :ip_blocks, :ip, unique: true, algorithm: :concurrently
end
def down
remove_index :ip_blocks, :ip, unique: true
end
end