Fix followers count not being updated when migrating follows (mastodo…

…n#19998)

Fixes mastodon#19900

app/workers/move_worker.rb

@@ -8,7 +8,9 @@ def perform(source_account_id, target_account_id)
  @target_account = Account.find(target_account_id)
 
  if @target_account.local? && @source_account.local?
- rewrite_follows!
+ nb_moved = rewrite_follows!
+ @source_account.update_count!(:followers_count, -nb_moved)
+ @target_account.update_count!(:followers_count, nb_moved)
  else
  queue_follow_unfollows!
  end

spec/workers/move_worker_spec.rb

@@ -74,6 +74,18 @@
  end
  end
 
+ shared_examples 'followers count handling' do
+ it 'updates the source account followers count' do
+ subject.perform(source_account.id, target_account.id)
+ expect(source_account.reload.followers_count).to eq(source_account.passive_relationships.count)
+ end
+
+ it 'updates the target account followers count' do
+ subject.perform(source_account.id, target_account.id)
+ expect(target_account.reload.followers_count).to eq(target_account.passive_relationships.count)
+ end
+ end
+
  context 'both accounts are distant' do
  describe 'perform' do
  it 'calls UnfollowFollowWorker' do
@@ -83,6 +95,7 @@
 
  include_examples 'user note handling'
  include_examples 'block and mute handling'
+ include_examples 'followers count handling'
  end
  end
 
@@ -97,6 +110,7 @@
 
  include_examples 'user note handling'
  include_examples 'block and mute handling'
+ include_examples 'followers count handling'
  end
  end
 
@@ -112,6 +126,7 @@
 
  include_examples 'user note handling'
  include_examples 'block and mute handling'
+ include_examples 'followers count handling'
 
  it 'does not fail when a local user is already following both accounts' do
  double_follower = Fabricate(:account)