Convert models to use new search includes mechanism

app/models/favorite_group.rb

@@ -27,7 +27,7 @@ class FavoriteGroup < ApplicationRecord
 
     def search(params)
       q = super
-      q = q.search_attributes(params, :name, :is_public, :post_ids, :creator)
+      q = q.search_attributes(params, :name, :is_public, :post_ids)
 
       if params[:name_matches].present?
         q = q.name_matches(params[:name_matches])
@@ -164,6 +164,10 @@ class FavoriteGroup < ApplicationRecord
     post_ids.include?(post_id)
   end
 
+  def self.searchable_includes
+    [:creator]
+  end
+
   def self.available_includes
     [:creator]
   end