src/select2.js
function(angular_data) {
          var model = [];
          if (!angular_data) {
            return model;
          }

          if (opts.simple_tags) {
            model = [];
            angular.forEach(
              angular_data,
              function(value, index) {
                model.push({'id': value, 'text': value});
              });
          } else {
            model = angular_data;
          }
          return model;
        }
function(angular_data) {
          var model = [];
          if (!angular_data) {
            return model;
          }

          if (opts.simple_tags) {
            model = [];
            angular.forEach(
              angular_data,
              function(value, index) {
                model.push({'id': value, 'text': value});
              });
          } else {
            model = angular_data;
          }
          return model;
        }
/*
Convert from Angular view-model to Select2 view-model.