angularjs 的select设置默认值

myAppModule.controller('FrmController', ['$scope',function($scope){

 $scope.colors = [
      {name:'black', shade:'dark'},
      {name:'white', shade:'light'},
      {name:'red', shade:'dark'},
      {name:'blue', shade:'dark'},
      {name:'yellow', shade:'light'}
    ];
 $scope.myColor = 'red';

}]);

</select> 如果写成 <select ng-model="myColor" 这样可以设置默认值, 但是提交的时候,要写上每个表单域的值, 如果写成<select ng-model="m.myColor" 只需要提交 $scropt.m 就可以, 但是这样 $scope.myColor = 'red'; 就不起作用了,有没有兼顾的写法?