javascript 如何在 Angular.js 中更改 $resource 返回的数据？
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How to alter the data returned by $resource in Angular.js?
提问by AngularChef
I'm using an API that returns JSON data in this format:
我正在使用以这种格式返回 JSON 数据的 API：
{
paging: {
previous: null,
next: null
},
data: [
{ title: 'First Item' },
{ title: 'Second Item' },
...
]
}
I'm using Angular's $resourceservice to fetch this data.
My code - which is located in a controller - goes something like this:
我正在使用 Angular 的$resource服务来获取这些数据。
我的代码 - 位于控制器中 - 是这样的：
var Entity = $resource('/api/entities');
var entities = $scope.entities = Entity.get();
And then, in the view, I can display the data like this:
然后，在视图中，我可以像这样显示数据：
<ul>
<li ng-repeat="entity in entities.data">{{entity.title}}</<li>
</ul>
It all works fine, but:
一切正常，但是：
- I'd rather expose only the contents of
entities.datato the view, instead of the wholeentitiesobject. How can I intercept the data returned by the GET request to modify it beforeit populates$scope.entities? - Correlated question: since I am fetching an arrayof data, it would be cleaner to use
Entity.query()instead ofEntity.get(). But if I useEntity.query()in the code above, I get an error "TypeError: Object # has no method 'push'". This makes sense, since the API is returning an object instead of an array (hence, no 'push' method on the object). Again, if I could extract the.dataattribute from the response, I'd have an array.
- 我宁愿只
entities.data向视图公开 的内容，而不是整个entities对象。如何拦截 GET 请求返回的数据以在填充之前对其进行修改$scope.entities？ - 相关的问题：因为我取一个阵列的数据，这将是清洁剂使用
Entity.query()代替Entity.get()。但是如果我Entity.query()在上面的代码中使用，我会得到一个错误“TypeError: Object # has no method 'push'”。这是有道理的，因为 API 返回的是对象而不是数组（因此，对象上没有“推送”方法）。同样，如果我可以.data从响应中提取属性，我会有一个数组。
Following these indicationsby Dan Boyon, I managed to customize the default $resourceservice and to override the .get() or .query() methods, but I'm not sure where to go from there.
按照Dan Boyon 的这些指示，我设法自定义了默认$resource服务并覆盖了 .get() 或 .query() 方法，但我不确定从哪里开始。
回答by Chris
I don't think you need to modify the get or query defaults. Just use the success callback to do what you want. It should be more robust as well.
我认为您不需要修改 get 或 query 默认值。只需使用成功回调来做你想做的事。它也应该更健壮。
Entity.get(
{}, //params
function (data) { //success
$scope.entities = data.data;
},
function (data) { //failure
//error handling goes here
});
Html will be cleaner, too:
Html 也会更干净：
<ul>
<li ng-repeat="entity in entities">{{entity.title}}</<li>
</ul>
By the way, I usually declare services for my resources and then inject them into my controllers as I need them.
顺便说一句，我通常为我的资源声明服务，然后在需要时将它们注入到我的控制器中。
myServices.factory('Entity', ['$resource', function ($resource) {
return $resource('/api/entities', {}, {
});
}]);
回答by Ismail RBOUH
You can use the Response Transformer (transformResponse) like this:
您可以像这样使用响应转换器 (transformResponse)：
$resource('/api/entities', {}, {
query: {
method: 'GET',
responseType: 'json',
isArray: true,
transformResponse: function (response) {
return response.data;
}
}
});
This code modifies the "query" method behaviour, you can do the same for "get" ... !
这段代码修改了“查询”方法的行为，你可以对“获取”...做同样的事情！
