converted implication.with_descendants to use cache.get_multi

app/models/tag_alias.rb

@@ -18,7 +18,7 @@ class TagAlias < ActiveRecord::Base
       end
     end
     
-    alias_hash.values.uniq
+    alias_hash.values.flatten.uniq
   end
   
   def absence_of_transitive_relation

app/models/tag_implication.rb

@@ -12,7 +12,9 @@ class TagImplication < ActiveRecord::Base
   validate :absence_of_circular_relation
   
   def self.with_descendants(names)
-    ([names] + where(["antecedent_name IN (?)", Array(names)]).all.map {|x| x.descendant_names_array}).flatten
+    Cache.get_multi(names.flatten, "ti") do |name|
+      ([name] + where(["antecedent_name = ?", name]).all.map {|x| x.descendant_names_array}).flatten
+    end.values.flatten.uniq
   end
   
   def absence_of_circular_relation