better check for forum post votability

app/models/forum_post.rb

@@ -125,7 +125,9 @@ class ForumPost < ApplicationRecord
   end
 
   def votable?
-    body.to_s.match?(/->/)
+    TagAlias.where(forum_post_id: id).exists? ||
+      TagImplication.where(forum_post_id: id).exists? ||
+      BulkUpdateRequest.where(forum_post_id: id).exists?
   end
 
   def voted?(user, score)

db/migrate/20190129012253_add_tag_relationship_forum_post_indices.rb

@@ -0,0 +1,8 @@
+class AddTagRelationshipForumPostIndices < ActiveRecord::Migration[5.2]
+  def change
+    execute "set statement_timeout = 0"
+    add_index :tag_aliases, :forum_post_id
+    add_index :tag_implications, :forum_post_id
+    add_index :bulk_update_requests, :forum_post_id
+  end
+end