TIL, 2017-07-10

ActiveRecord::EachValidator, how to write it.
Apparently there is an options field there?
Confirming: Rails find method: find, if many, return all, if unable to find all, raise ActiveRecord::RecordNotFound.
Select. From in Rails.
Namespacing: If the namespace verb already exists in the current namespace, that’s when you do the :: before.
paranoia or acts_as_paranoid for soft delete: this would work only if you need the parent when calling from the orphan.
Rails.root.
Twilio has a lookup API.
AR is peppered with RangeError–raised when a numerical value is out of range.
Daemonize Redis: redis-server &.
Redis sentinel: High availability for Redis. Using Sentinel, you can create a Redis deployment that resists without human intervention to certain kinds of failures.
- Distributed system: Acts as authority for clients service: clients connect to Sentinels in order to ask for the current Redis master responsible for a given service.