关于angular.js中的$resource中的问题。

Question

就比如下面这段代码好了：

angular.module('myApp').factory('Entry', function($resource){
    return $resource('/api/entries/:id', {id:'@_id'},{
        update: {
          method: 'PUT'
        }
    });
});

这里面的/api/entries/:id这个：id是什么意思啊？{id:'@_id'}还有这个@_id又表示什么意思呢？为什么前面多加了一个_了，我知道好像$resource在保存数据的时候会自动增加一个属性就是_id,但是这前前后后到底有什么因果关系呢？

Answer 1

Thanks for the invitation, although I have never used itngResource.

Then I will answer them in order

"What does /api/entries/:id里，:idmean"

Answer: :id是一个占位符行为，意思是，在你真正发起请求时，该位置会被真正传入的的参数所替换。譬如：/api/entries/9970

"What does the second parameter{id:'@_id'}里，@_idmean?"

Answer: The second parameter is the default parameter. If it starts with @开头，则表示真正请求时，会从你传入的对象中找@后面的的字段，这里就是从你传入的对象中找_id字段对应的值，并替换URL里的:id, it forms a real URL.

Finally, although the documentation of ngResource is not very well written, it contains what I mentioned. It is recommended to read the document carefully. If you don’t understand something, do more experiments and compare the results to understand

Answer 2

I haven’t used it for a long time$resource了，不过'/api/entries/:id'是请求数据的路由，:id会被后面的{id:'@_id'}中的@_id替代，:idIt’s a routing parameter, it should look like this, I haven’t used it for a long time, I forgot

Answer 3

Thanks for the invitation.

Actually, I hardly use it. $resource这个东西，与ui-routerSimilar, in fact, to put it bluntly, it is a problem of passing parameters when the route is changed, but the form is different. @leftstick said it in detail, I don’t need to explain it anymore.