fix validation error (media only status) (#6684)

* fix validation error (media only status)

* Incorporating review suggestions

* Reflect similar fix to OStatus side

* Fix not to include media in transaction

* Restore the limit of the number of media

* Fix not to return nil

app/lib/activitypub/activity/create.rb

@@ -20,13 +20,12 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
   private
 
   def process_status
-    media_attachments = process_attachments
+    status_params = process_status_params
 
     ApplicationRecord.transaction do
       @status = Status.create!(status_params)
 
       process_tags(@status)
-      attach_media(@status, media_attachments)
     end
 
     resolve_thread(@status)
@@ -40,7 +39,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     status
   end
 
-  def status_params
+  def process_status_params
     {
       uri: @object['id'],
       url: object_url || @object['id'],
@@ -54,6 +53,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
       visibility: visibility_from_audience,
       thread: replied_to_status,
       conversation: conversation_from_uri(@object['conversation']),
+      media_attachments: process_attachments.take(4),
     }
   end
 
@@ -108,7 +108,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
   end
 
   def process_attachments
-    return if @object['attachment'].nil?
+    return [] if @object['attachment'].nil?
 
     media_attachments = []
 
@@ -132,13 +132,6 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     media_attachments
   end
 
-  def attach_media(status, media_attachments)
-    return if media_attachments.blank?
-
-    media = MediaAttachment.where(status_id: nil, id: media_attachments.take(4).map(&:id))
-    media.update(status_id: status.id)
-  end
-
   def resolve_thread(status)
     return unless status.reply? && status.thread.nil?
     ThreadResolveWorker.perform_async(status.id, in_reply_to_uri)

app/lib/ostatus/activity/creation.rb

@@ -29,7 +29,7 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
     # Skip if the reblogged status is not public
     return if cached_reblog && !(cached_reblog.public_visibility? || cached_reblog.unlisted_visibility?)
 
-    media_attachments = save_media
+    media_attachments = save_media.take(4)
 
     ApplicationRecord.transaction do
       status = Status.create!(
@@ -44,12 +44,12 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
         language: content_language,
         visibility: visibility_scope,
         conversation: find_or_create_conversation,
-        thread: thread? ? find_status(thread.first) || find_activitypub_status(thread.first, thread.second) : nil
+        thread: thread? ? find_status(thread.first) || find_activitypub_status(thread.first, thread.second) : nil,
+        media_attachments: media_attachments
       )
 
       save_mentions(status)
       save_hashtags(status)
-      attach_media(status, media_attachments)
       save_emojis(status)
     end
 
@@ -159,13 +159,6 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
     media_attachments
   end
 
-  def attach_media(parent, media_attachments)
-    return if media_attachments.blank?
-
-    media = MediaAttachment.where(status_id: nil, id: media_attachments.take(4).map(&:id))
-    media.update(status_id: parent.id)
-  end
-
   def save_emojis(parent)
     do_not_download = DomainBlock.find_by(domain: parent.account.domain)&.reject_media?