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Mongoid Polymorphic Association suddenly not working on Heroku / MongoHQ
Notification.create(
  type: "new_comment",
  recipient: recipient,
  actor: self.user,
  subject: self,
  secondary_subject: self.post)

Notification.create(
  type: "new_comment",
  recipient_id: recipient.id,
  recipient_type: recipient.class.to_s,
  actor_id: self.user.id,
  actor_type: self.user.class.to_s,
  subject: self,
  secondary_subject: self.post)

class Notification
  belongs_to :recipient, class_name: "User", index: true
  belongs_to :actor,     class_name: "User", index: true
end

class User
  has_many :notifications, as: :recipient
end