How to handle $resource service errors in AngularJS

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
});