refactored tsquery sql to use rails escaping mechanisms

config/initializers/core_extensions.rb

@@ -5,6 +5,14 @@ module Danbooru
         return self.gsub(/\\/, '\0\0').gsub(/(%|_)/, "\\\\\\1").gsub(/\*/, '%')
       end
 
+      def to_escaped_for_tsquery_split
+        scan(/\S+/).map {|x| x.to_escaped_for_tsquery}.join(" & ")
+      end
+
+      def to_escaped_for_tsquery
+        "'#{gsub(/\\|'/, '\0\0\0\0')}'"
+      end
+      
       def to_escaped_js
         return self.gsub(/\\/, '\0\0').gsub(/['"]/) {|m| "\\#{m}"}.gsub(/\r\n|\r|\n/, '\\n')
       end