Period of Time with Ruby on Rails and Integers | ActiveSupport::Duration

From the rails console try next:

```shell
irb(main):001:0> period_of_time = 10.minutes
=> 10 minutes
irb(main):002:0> period_of_time.class
=> ActiveSupport::Duration
irb(main):003:0> period_of_time = 10.hours
=> 10 hours
irb(main):004:0> period_of_time.class
=> ActiveSupport::Duration
irb(main):005:0> period_of_time.to_i
=> 36000
```
Useful when you work with `devise` authentication gem, e.g to expire the session in a certain period of time.

```ruby
class User < ApplicationRecord
  devise :database_authenticatable, :timeoutable,
    timeout_in: ENV['EXPIRATION_TIME_IN_MINUTES'].to_i.minutes || 10.minutes
end
```

And so on...

```shell
User.where(created_at: 20.days.ago..10.minutes.ago)
```

emmanuel-oseguera
February 15, 2021