What should be used for the task?

Question

Ruby on Rails

There is a notification model (t.text :description, t.datetime :time_sending) that sends a notification.description to user.email according to the time from notification.time_sending. Recommend a gem :) Thank you!

Answer 1

You need ActionMailer and DelayedJob (possible through ActionJob) and direct hands.
Periodically run a Rake task with SELECT time_sending for a certain period of time and if there are records, then send them . The mailing will be approximately at time_sending.

Answer 2

You can use it like this, dynamically manage tasks in the cron. https://github.com/moove-it/sidekiq-scheduler