资源解析后,在ngResource对象的$ promise属性的then()函数中获取响应头？

Question

我愿意检索资源请求的响应头,因为我在其中放入了分页信息和其他内容而不是响应主体,以使REST api清晰.

虽然我们可以从成功/错误回调中获取它,如下所示:

Object.get({type:'foo'}, function(value, responseHeaders){
    var headers = responseHeaders();
});

'Object'是我的资源工厂服务.

此外,当我尝试在解决所需资源后更改路由时,我尝试过:

.when('/list', {
    templateUrl: 'partials/list.html',
    controller: 'ListCtrl',

    // wait for the required promises to be resolved before controller is instantialized
    resolve: {
        objects: ['Object', '$route', function(Object, $route){
            return Object.query($route.current.params).$promise;
        }]
    }
})

并且在控制器中,只需注入"对象"而不是对象服务,因为它已经解析并填充了真实数据.

但是当我尝试从控制器中的"对象"获取头信息时,我遇到了问题.

我试过了objects.$promise.then(function(data, responseHeaders){}),但是responseHeader是未定义的.

如何更改$ resource服务的行为,以便将responseHeader getter抛出到$ promise then()回调函数中？

我的服务"对象"供参考:

myServices.factory('Object', ['$resource',
    function($resource){
        return $resource('object/:id', {id: '@id'}, {
            update: {method: 'PUT'},
        });
    }
]);

Answer 1

我有同样的问题.我在资源定义中使用了一个拦截器来在资源中注入http头.

$resource('/api/resource/:id', {
    id: '@id'
  }, {
    index: {
      method: 'GET',
      isArray: true,
      interceptor: {
        response: function(response) {
          response.resource.$httpHeaders = response.headers;
          return response.resource;
        }
      }
    }});

然后,在then回调中,可以通过$httpHeaders以下方式访问http标头:

promise.then(function(resource) {
    resource.$httpHeaders('header-name');
});

Answer 2

我想我遇到了类似的问题:在POST一个新资源之后我需要获取响应的Location头,因为新资源的Id在服务器上设置然后通过这个头返回.

我通过引入我自己的承诺解决了这个问题:

app.factory('Rating', ['$resource',
    function ($resource) {

        // Use the $resource service to declare a restful client -- restangular might be a better alternative
        var Rating = $resource('http://localhost:8080/courserater/rest/ratings-cors/:id', {id: '@id'}, {
            'update': { method: 'PUT'}
        });

    return Rating;
}]);

function RestController($scope, $q, Rating) {
  var rating = new Rating();
  var defer = $q.defer(); // introduce a promise that will be resolved in the success callback
  rating.$save(function(data, headers){ // perform a POST
      // The response of the POST contains the url of the newly created resource
      var newId = headers('Location').split('/').pop();
      defer.resolve(newId)
    });
    return defer.promise;
  })
  .then (function(newId) {
    // Load the newly created resource
    return Rating.get({id: newId}).$promise; // perform GET
  })
  .then(function(rating){
    // update the newly created resource
    rating.score = 55;
    return rating.$update(); // perform PUT
  });
}