pundit: convert post flags to pundit.

app/policies/post_flag_policy.rb

@@ -0,0 +1,13 @@
+class PostFlagPolicy < ApplicationPolicy
+  def can_search_flagger?
+    user.is_moderator?
+  end
+
+  def can_view_flagger?
+    (user.is_moderator? || record.creator_id == user.id) && (record.post&.uploader_id != user.id)
+  end
+
+  def permitted_attributes
+    [:post_id, :reason]
+  end
+end