Put the attached file into config/initializers/ to be able to say created_within on any ActiveRecord or its scope chain. This will return a scope of all records created between two given timestamps.

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Use it like that:
Booking.created_within(1.year.ago, Date.yesterday).count
User.active.created_within(1.hour.ago, DateTime.now)

It explicitly looks at the database table name so you are usually fine when joining other tables.