code: function buildOptions(data) {
      var slg = slug(_.get(data, slugField), slugOptions),
        key = doc + '|'
  
      // Build scope key
      for (var i = 0; i < scope.length; i++) {
        var k = scope[i]
        key += k + '*' + (_.get(data, k) || '?') + '*'
      }
  
      return {
        slg: slg,
        key: key
      }
    }
docs: Build options