1 files changed, 44 insertions, 0 deletions
diff --git a/app/services/achievements/update_user_achievement_priorities_service.rb b/app/services/achievements/update_user_achievement_priorities_service.rb
new file mode 100644
index 00000000000..1165a1b3bf6
--- /dev/null
+++ b/app/services/achievements/update_user_achievement_priorities_service.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+module Achievements
+  class UpdateUserAchievementPrioritiesService
+    attr_reader :current_user, :user_achievements
+
+    def initialize(current_user, user_achievements)
+      @current_user = current_user
+      @user_achievements = user_achievements
+    end
+
+    def execute
+      return error_no_permissions unless allowed?
+
+      prioritized_user_achievements_map = Hash[user_achievements.map.with_index { |ua, idx| [ua.id, idx] }]
+
+      user_achievements_priorities_mapping = current_user.user_achievements.each_with_object({}) do |ua, result|
+        next if ua.priority.nil? && !prioritized_user_achievements_map.key?(ua.id)
+
+        result[ua] = { priority: prioritized_user_achievements_map.fetch(ua.id, nil) }
+      end
+
+      return ServiceResponse.success(payload: []) if user_achievements_priorities_mapping.empty?
+
+      ::Gitlab::Database::BulkUpdate.execute(%i[priority], user_achievements_priorities_mapping)
+
+      ServiceResponse.success(payload: user_achievements_priorities_mapping.keys.map(&:reload))
+    end
+
+    private
+
+    def allowed?
+      user_achievements.all? { |user_achievement| current_user&.can?(:update_owned_user_achievement, user_achievement) }
+    end
+
+    def error(message)
+      ServiceResponse.error(payload: user_achievements, message: Array(message))
+    end
+
+    def error_no_permissions
+      error("You can't update at least one of the given user achievements.")
+    end
+  end
+end