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up vote 27 down vote favorite
11

I am making requests to my API and I am using AngularJS $resource module. It's different from $http so I don't know how to handle my errors.

My service:

var appServices = angular.module('app.services', ['ngResource']);
appServices.factory('Category', ['$resource',
    function($resource){
        return $resource('/apicategoryerr/?format=:format', {}, {
            query: {
                method: 'GET', 
                params: { format: 'json'}, 
                isArray: true,

            }
        });
    }]);

My Controller:

...
Category.query(function(data) {
                console.log(data);
            });
...

I want something like this or .. I don't know a way to handle errors if my API is not working..

Category.query().success(function() {
                console.log('success');
            }).error(function() {
                console.log('error');
            });
share|improve this question

2 Answers 2

up vote 61 down vote accepted

you can pass the error handler as a second parameter toquery.

Category.query(function(data) {}, function() {});

EDIT:

to make things a bit clearer, some examples:

var Resource = $resource('/restapi/resource');

Resource.query(function(data) {
    // success handler
}, function(error) {
    // error handler
});

Resource.query({
    'query': 'thequery'
},function(data) {
    // success handler
}, function(error) {
    // error handler
});

Resource.query().$promise.then(function(data) {
    // success handler
}, function(error) {
    // error handler
});

Resource.query({
    'query': 'thequery'
}).$promise.then(function(data) {
    // success handler
}, function(error) {
    // error handler
});
share|improve this answer
    
In the documentation it looks more like the 3rd parameter is the error callback. "Resource.action([parameters], [success], [error])" docs.angularjs.org/api/ngResource.$resource –  Marcel Dec 14 '13 at 18:20
    
yes, if you do pass a config object. –  reagten Dec 14 '13 at 18:43
1  
is there a way to define a default error handler common to all use of this resource (e.g. "resource not authorized by server" ? –  Nicolas Janel Sep 5 '14 at 12:32
    
@NicolasJanel You could define a function that would handle it then do Resource.query().$promise.then(function(data) {}, errorFunction). You'll still have to include it every place you use a query, but at least you won't be redefining it each time. –  schillingt Sep 10 '14 at 12:40
1  
@Kaspar the return value of instance methods such as myResource.$save and myResource.$delete is the promise. So you can just do myResource.$save().then(...). –  Carl G Dec 31 '14 at 17:06
up vote 17 down vote

You can define a error handler at the creation step of the resource by adding an interceptor object in the description of a method, with a responseError property, linked to your error function.

function resourceErrorHandler(response) { ... }

$resource('/path/:param/', {} , 
{
        'get':    {method:'GET', 
                   interceptor : {responseError : resourceErrorHandler}},
        'save':   {method:'POST'},
        'query':  {method:'GET', isArray:true, 
                   interceptor : {responseError : resourceErrorHandler}},
        'remove': {method:'DELETE'},
        'delete': {method:'DELETE'}
};

where resourceErrorHandler is a function called on each error on get or query method. For the problem asked, the get method is the only needed. Of course you can apply that to any action.

An other interceptor response exists for $resource to catch a normal response.

 {'get': {method:'GET', interceptor : {response : resourceResponseHandler}},

Interceptors are part of the $http module, you can further read about them in their docs.

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