Optimize map { ... }.compact calls (#15513)

* Optimize map { ... }.compact

using Enumerable#filter_map, supported since Ruby 2.7

* Add poyfill for Enumerable#filter_map

1 files changed, 2 insertions, 2 deletions

diff --git a/app/lib/activitypub/activity/flag.rb b/app/lib/activitypub/activity/flag.rb
index 1659bc61f..8dfc76f0a 100644
--- a/app/lib/activitypub/activity/flag.rb
+++ b/app/lib/activitypub/activity/flag.rb
@@ -4,8 +4,8 @@ class ActivityPub::Activity::Flag < ActivityPub::Activity
   def perform
     return if skip_reports?
 
-    target_accounts            = object_uris.map { |uri| account_from_uri(uri) }.compact.select(&:local?)
-    target_statuses_by_account = object_uris.map { |uri| status_from_uri(uri) }.compact.select(&:local?).group_by(&:account_id)
+    target_accounts            = object_uris.filter_map { |uri| account_from_uri(uri) }.select(&:local?)
+    target_statuses_by_account = object_uris.filter_map { |uri| status_from_uri(uri) }.select(&:local?).group_by(&:account_id)
 
     target_accounts.each do |target_account|
       target_statuses = target_statuses_by_account[target_account.id]