Unable to use $update, $remove and $save in ngresource - angularjs

Question

I am using ngresource as follows but unfortunately I am unable to access the $update, $remove and $save methods in this way. What am I doing wrong?
angular.module('myApp.services').factory('Entry', function($resource) {
return {
method1: $resource('/api/entries/:id', { id: '#_id' }, {
update: {
method: 'PUT' // this method issues a PUT request
}
}),
method2: $resource('/api/entries2', {}, {
})
});
// not working: Entries is not a function at Scope.$scope.save
var entry = new Entries({});
entry.method1.$update();
entry.method1.$save();
entry.method1.$delete();
On the other hand, this works:
angular.module('myApp.services').factory('Entry', function($resource) {
return $resource('/api/entries/:id', { id: '#_id' }, {
update: {
method: 'PUT' // this method issues a PUT request
}
});
});
var entry = new Entries({});
entry.$update();
entry.$save();
entry.$delete();

Answer 1

So your second example doing $resource('http://example.com/resource.json') is the correct usage of that construction, while the first one is not.
After executing var entry = new Entries({}); you get entry as factory instance in your controller, which has available actions that you've defined for it.
UPD
You can have multiple resources in the service - https://stackoverflow.com/a/17163459/405623. In your example you've just missed the ['ngResource'] DI in your module.