class CreateDigestUnsubscribeKeys < ActiveRecord::Migration[4.2] def up create_table :digest_unsubscribe_keys, id: false do |t| t.string :key, limit: 64, null: false t.integer :user_id, null: false t.timestamps null: false end execute "ALTER TABLE digest_unsubscribe_keys ADD PRIMARY KEY (key)" add_index :digest_unsubscribe_keys, :created_at migrate_redis_keys end # It is slightly odd to migrate from redis to postgres; I imagine a lot # could fail, so if anything does we just rescue def migrate_redis_keys return if Rails.env.test? temp_keys = $redis.keys('temporary_key:*') if temp_keys.present? temp_keys.map! do |key| user_id = $redis.get(key).to_i ttl = $redis.ttl(key).to_i if ttl > 0 ttl = "'#{ttl.seconds.ago.strftime('%Y-%m-%d %H:%M:%S')}'" else ttl = "CURRENT_TIMESTAMP" end $redis.del(key) key.gsub!('temporary_key:', '') user_id ? "('#{key}', #{user_id}, #{ttl}, #{ttl})" : nil end temp_keys.compact! if temp_keys.present? execute "INSERT INTO digest_unsubscribe_keys (key, user_id, created_at, updated_at) VALUES #{temp_keys.join(', ')}" end end rescue # If anything goes wrong, continue with other migrations end def down drop_table :digest_unsubscribe_keys end end