code: def meta_tag(attr_name, options={})
        key = normalize_meta_tag_name(attr_name)
  
        cached_meta_tags[key] ||= self.meta_tags.detect {|t| t.name == key}
        cached_meta_tags[key] ||= self.meta_tags.build(:name => key) if options[:build]
        cached_meta_tags[key]
      end
docs: Save meta tags records into one hash