Change how changes to media attachments are stored for edits (#17696)

* Change how changes to media attachments are stored for edits

Fix not being able to re-order media attachments

* Fix not broadcasting updates when polls/media is changed through ActivityPub

* Various fixes and improvements

* Update app/models/report.rb

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Add tracking of media attachment description changes

* Change poll in status edit to have a structure closer to the real one

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/services/activitypub/process_status_update_service.rb

@@ -76,13 +76,14 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
       end
     end
 
-    removed_media_attachments = previous_media_attachments - next_media_attachments
-    added_media_attachments   = next_media_attachments - previous_media_attachments
+    added_media_attachments = next_media_attachments - previous_media_attachments
 
-    MediaAttachment.where(id: removed_media_attachments.map(&:id)).update_all(status_id: nil)
     MediaAttachment.where(id: added_media_attachments.map(&:id)).update_all(status_id: @status.id)
 
-    @media_attachments_changed = true if removed_media_attachments.any? || added_media_attachments.any?
+    @status.ordered_media_attachment_ids = next_media_attachments.map(&:id)
+    @status.media_attachments.reload
+
+    @media_attachments_changed = true if @status.ordered_media_attachment_ids_changed?
   end
 
   def update_poll!
@@ -215,19 +216,13 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
 
     return if @status.edits.any?
 
-    @status.snapshot!(
-      media_attachments_changed: false,
-      at_time: @status.created_at
-    )
+    @status.snapshot!(at_time: @status.created_at)
   end
 
   def create_edit!
     return unless significant_changes?
 
-    @status.snapshot!(
-      media_attachments_changed: @media_attachments_changed || @poll_changed,
-      account_id: @account.id
-    )
+    @status.snapshot!(account_id: @account.id)
   end
 
   def skip_download?

app/services/fan_out_on_write_service.rb

@@ -110,7 +110,7 @@ class FanOutOnWriteService < BaseService
     Redis.current.publish('timeline:public', anonymous_payload)
     Redis.current.publish(@status.local? ? 'timeline:public:local' : 'timeline:public:remote', anonymous_payload)
 
-    if @status.media_attachments.any?
+    if @status.with_media?
       Redis.current.publish('timeline:public:media', anonymous_payload)
       Redis.current.publish(@status.local? ? 'timeline:public:local:media' : 'timeline:public:remote:media', anonymous_payload)
     end

app/services/post_status_service.rb

@@ -100,7 +100,10 @@ class PostStatusService < BaseService
   end
 
   def validate_media!
-    return if @options[:media_ids].blank? || !@options[:media_ids].is_a?(Enumerable)
+    if @options[:media_ids].blank? || !@options[:media_ids].is_a?(Enumerable)
+      @media = []
+      return
+    end
 
     raise Mastodon::ValidationError, I18n.t('media_attachments.validations.too_many') if @options[:media_ids].size > 4 || @options[:poll].present?
 
@@ -157,6 +160,7 @@ class PostStatusService < BaseService
     {
       text: @text,
       media_attachments: @media || [],
+      ordered_media_attachment_ids: (@options[:media_ids] || []).map(&:to_i) & @media.map(&:id),
       thread: @in_reply_to,
       poll_attributes: poll_attributes,
       sensitive: @sensitive,

app/services/remove_status_service.rb

@@ -40,7 +40,7 @@ class RemoveStatusService < BaseService
           remove_reblogs
           remove_from_hashtags
           remove_from_public
-          remove_from_media if @status.media_attachments.any?
+          remove_from_media if @status.with_media?
           remove_media
         end
 

app/services/update_status_service.rb

@@ -17,8 +17,6 @@ class UpdateStatusService < BaseService
     @status                    = status
     @options                   = options
     @account_id                = account_id
-    @media_attachments_changed = false
-    @poll_changed              = false
 
     Status.transaction do
       create_previous_edit!
@@ -41,14 +39,12 @@ class UpdateStatusService < BaseService
   def update_media_attachments!
     previous_media_attachments = @status.media_attachments.to_a
     next_media_attachments     = validate_media!
-    removed_media_attachments  = previous_media_attachments - next_media_attachments
     added_media_attachments    = next_media_attachments - previous_media_attachments
 
-    MediaAttachment.where(id: removed_media_attachments.map(&:id)).update_all(status_id: nil)
     MediaAttachment.where(id: added_media_attachments.map(&:id)).update_all(status_id: @status.id)
 
+    @status.ordered_media_attachment_ids = (@options[:media_ids] || []).map(&:to_i) & next_media_attachments.map(&:id)
     @status.media_attachments.reload
-    @media_attachments_changed = true if removed_media_attachments.any? || added_media_attachments.any?
   end
 
   def validate_media!
@@ -73,19 +69,18 @@ class UpdateStatusService < BaseService
 
       # If for some reasons the options were changed, it invalidates all previous
       # votes, so we need to remove them
-      @poll_changed = true if @options[:poll][:options] != poll.options || ActiveModel::Type::Boolean.new.cast(@options[:poll][:multiple]) != poll.multiple
+      poll_changed = true if @options[:poll][:options] != poll.options || ActiveModel::Type::Boolean.new.cast(@options[:poll][:multiple]) != poll.multiple
 
       poll.options     = @options[:poll][:options]
       poll.hide_totals = @options[:poll][:hide_totals] || false
       poll.multiple    = @options[:poll][:multiple] || false
       poll.expires_in  = @options[:poll][:expires_in]
-      poll.reset_votes! if @poll_changed
+      poll.reset_votes! if poll_changed
       poll.save!
 
       @status.poll_id = poll.id
     elsif previous_poll.present?
       previous_poll.destroy
-      @poll_changed = true
       @status.poll_id = nil
     end
   end
@@ -136,16 +131,10 @@ class UpdateStatusService < BaseService
 
     return if @status.edits.any?
 
-    @status.snapshot!(
-      media_attachments_changed: false,
-      at_time: @status.created_at
-    )
+    @status.snapshot!(at_time: @status.created_at)
   end
 
   def create_edit!
-    @status.snapshot!(
-      media_attachments_changed: @media_attachments_changed || @poll_changed,
-      account_id: @account_id
-    )
+    @status.snapshot!(account_id: @account_id)
   end
 end