Refactor domain expiration email

#186

app/models/concerns/domain/expirable.rb

@@ -0,0 +1,31 @@
+module Concerns::Domain::Expirable
+  extend ActiveSupport::Concern
+
+  included do
+    alias_attribute :expire_time, :valid_to
+  end
+
+  class_methods do
+    def expired
+      where("#{attribute_alias(:expire_time)} <= ?", Time.zone.now)
+    end
+  end
+
+  def registered?
+    valid_to >= Time.zone.now
+  end
+
+  def expired?
+    statuses.include?(DomainStatus::EXPIRED)
+  end
+
+  def expirable?
+    return false if valid_to > Time.zone.now
+
+    if expired? && outzone_at.present? && delete_at.present?
+      return false
+    end
+
+    true
+  end
+end