Pub-sub library with active_record and action_controller hooks
Decouple your models with event listeners
This is an example where we subscribe to all update calls for all ActiveRecord models
class UserSideEffects
include Hearsay::Subscriber::ActiveRecord
subscribe_to User, :create
# Do stuff after user creation
def self.create(event)
UserMailer.welcome(event.payload[:id]).deliver_later
AnalyticsService.register event
end
end
When the User.create call occurs any classes that are subscribed to the User class and create callback will receive a method call corresponding to the lifecycle event that occurred.
The event is a ActiveSupport::Notifications::Event
This is an example where we subscribe to all update calls for all ActiveRecord models
class AuditTrail
include Hearsay::Subscriber::ActiveRecord
subscribe_to :all, :update
# Track all model changes
def self.update(event)
Log.json! event
end
end
OUTPUT
Cat.last.update_attributes name: "Stephen"
{"name":"hearsay.active_record.Cat.update","payload":{"attributes":{"id":47,"name":"Stephen","type":"Cat","age":null,"created_at":"2017-05-09T08:50:14.158Z","updated_at":"2017-05-09T08:57:41.168Z"},"changes":{"name":["ste","Stephen"],"updated_at":["2017-05-09T08:57:00.959Z","2017-05-09T08:57:41.168Z"]}},"time":"2017-05-09T01:57:41.170-07:00","transaction_id":"b78827efc356421a77b3","end":"2017-05-09T01:57:41.170-07:00","children":[],"duration":null}
The gem is available as open source under the terms of the MIT License.