Move draft sequence incrementing out of `after_save`

app/models/post.rb

@@ -2,6 +2,7 @@ require_dependency 'jobs'
 require_dependency 'pretty_text'
 require_dependency 'rate_limiter'
 require_dependency 'post_revisor'
+require_dependency 'enum'
 
 require 'archetype'
 require 'digest/sha1'
@@ -369,9 +370,13 @@ class Post < ActiveRecord::Base
     Notification.delete_all topic_id: topic_id, post_number: post_number
   end
 
-  after_save do
-    DraftSequence.next! last_editor_id, topic.draft_key if topic # could be deleted
 
+  def advance_draft_sequence
+    return if topic.blank? # could be deleted
+    DraftSequence.next!(last_editor_id, topic.draft_key)
+  end
+
+  after_save do
     quoted_post_numbers << reply_to_post_number if reply_to_post_number.present?
 
     # Create a reply relationship between quoted posts and this new post

lib/post_creator.rb

@@ -117,6 +117,9 @@ class PostCreator
                     created_at: post.created_at,
                     user: BasicUserSerializer.new(post.user).as_json(root: false),
                     post_number: post.post_number)
+
+      # Advance the draft sequence
+      post.advance_draft_sequence
     end
 
     post

lib/post_revisor.rb

@@ -13,6 +13,7 @@ class PostRevisor
     revise_post
     update_category_description
     post_process_post
+    @post.advance_draft_sequence
     true
   end
 

spec/models/draft_spec.rb

@@ -61,9 +61,12 @@ describe Draft do
     end
 
     it 'nukes the post draft when a post is created' do
-      p = Fabricate(:post)
+      user = Fabricate(:user)
+      topic = Fabricate(:topic)
+      p = PostCreator.new(user, raw: Fabricate.build(:post).raw, topic_id: topic.id).create
       Draft.set(p.user, p.topic.draft_key, 0,'hello')
-      Fabricate(:post, topic: p.topic, user: p.user)
+
+      PostCreator.new(user, raw: Fabricate.build(:post).raw).create
       Draft.get(p.user, p.topic.draft_key, DraftSequence.current(p.user, p.topic.draft_key)).should be_nil
     end