delivery strategy

ds.rb

class TagSubscription < ActiveRecord::Base
  belongs_to :delivery_strategy
end
class DeliveryStrategy < ActiveRecord::Base
  # Attributes:
  #     type: can be 'real_time', 'daily' or 'weekly'
  #     day: contain the day of the week
  #     time: the time of the day (morning, afternoon, night)
  #
  has_many :tag_subscriptions
end

# Find immediate deliveries
DeliveryStrategy.where(:type => :real_time)

# Find daily deliveries of the morning
DeliveryStrategy.where(:type => :daily, :time => :morning)

# Weekly subscriptions to be delivered every Tuesday night
DeliveryStrategy.where(:type => :weekly, :day => :tuesday, :time => :night)

I'm ok with it, I was thinking if DeliveryStrategy needed to be an AR, but I agree with it...

If for some reason we get more types of subscriptions, we can easily port to a polymorphic version..

👍