Simplify User.comment_notifiable scope

app/jobs/event_comment_mail_job.rb

@@ -4,9 +4,7 @@ class EventCommentMailJob < ApplicationJob
   queue_as :default
 
   def perform(comment)
-    conference = comment.commentable.program.conference
-
-    User.comment_notifiable(conference).each do |user|
+    User.comment_notifiable(comment.conference_id).each do |user|
       Mailbot.event_comment_mail(comment, user).deliver_now
     end
   end

app/models/comment.rb

@@ -57,13 +57,13 @@ class Comment < ApplicationRecord
     commentable_str.constantize.find(commentable_id)
   end
 
+  def conference_id
+    commentable.program.conference_id
+  end
+
   private
 
   def send_notification
     EventCommentMailJob.perform_later(self)
   end
-
-  def conference_id
-    commentable.program.conference_id
-  end
 end

app/models/user.rb

@@ -37,7 +37,7 @@ class User < ApplicationRecord
   after_save :touch_events
 
   # add scope
-  scope :comment_notifiable, ->(conference) {joins(:roles).where('roles.name IN (?)', [:organizer, :cfp]).where('roles.resource_type = ? AND roles.resource_id = ?', 'Conference', conference.id)}
+  scope :comment_notifiable, ->(conference_id) {joins(:roles).where('roles.name IN (?)', [:organizer, :cfp]).where('roles.resource_type = ? AND roles.resource_id = ?', 'Conference', conference_id)}
 
   # scopes for user distributions
   scope :recent, lambda {

spec/models/user_spec.rb

@@ -88,11 +88,11 @@ describe User do
       let(:cfp_user) { create(:user, role_ids: [cfp_role.id]) }
 
       it 'includes organizer and cfp user' do
-        expect(User.comment_notifiable(conference)).to include(organizer, cfp_user)
+        expect(User.comment_notifiable(conference.id)).to include(organizer, cfp_user)
       end
 
       it 'excludes ordinary user' do
-        expect(User.comment_notifiable(conference)).not_to include(user)
+        expect(User.comment_notifiable(conference.id)).not_to include(user)
       end
     end