Ionic - when should ionicModal.remove() be called? [Ionic Modal Hide Callback]

In my controller, modal views are initialized with a factory by listening to the $ionicView.afterEnter event. As the documentation suggests, modal views should be removed whenever the current active ionic view is about to be destroyed. A function is called in the $ionicView.beforeLeave callback in order to remove the modal views.

.controller('UserProfileCtrl', function($scope, $state, user, ModalFactory) {
    $scope.user = user;

    $scope.checkOrders = function() {
        $state.go('app.orders');
    };

    $scope.$on('$ionicView.afterEnter', function() {
        $scope.modals = ModalFactory.getUserProfileModals($scope, user.photos);
    });

    $scope.$on('$ionicView.beforeLeave', function() {
        $scope.modals.remove();
    });
});

.factory('ModalFactory', function($ionicModal, $ionicSlideBoxDelegate) {
    var modalFactory = {};

    modalFactory.getUserProfileModals = function(scope, images) {
        var modals = {
            'views': [],
            'data': []
        };

        $ionicModal.fromTemplateUrl('templates/modals/common/image-view.html', { 'scope': scope }).then(function(modal) { modals.views.imageView = modal; });

        if (images) {
            modals.data.images = images;
        }

        modals.open = function(view, slide) {
            Object.keys(this.views).forEach(function(key, index) {
                console.log(key);
            });

            if (view && this.views.hasOwnProperty(view)) {
                this.views[view].show();

                if (view == 'imageView' && slide) {
                    $ionicSlideBoxDelegate.$getByHandle('image-view').slide(slide);
                }
            }
        };

        modals.close = function(view) {
            Object.keys(this.views).forEach(function(key, index) {
                console.log(key);
            });

            if (view && this.views.hasOwnProperty(view)) {
                this.views[view].hide();
            } else {
                Object.keys(this.views).forEach(function(key, index) {
                    this.views[key].hide();
                });
            }
        };

        modals.remove = function() {
            console.log('remove');
            Object.keys(this.views).forEach(function(key, index) {
                console.log(key);
            });

            this.data.splice(0, this.data.length);

            Object.keys(this.views).forEach(function(key, index) {
                this.views[key].remove();
            });

            this.views.splice(0, this.views.length);
        };

        return modals;
    };

    return modalFactory;
});

However, I get the following output in the console when I execute these actions in sequence:

1. call $scope.modals.open('imageView', 1),
2. call $scope.modals.close(),
3. navigate to another page with $state.go('app.orders').

I tried listening to $destroy instead of $ionicView.beforeLeave, but then $scope.modals.remove() is not called at all. It seems $destroy is not fired when I am testing my application with Chrome.

Can anyone tell me when should I remove the modal views, and why is there such an error message in my scenario?

Update

After I modified the code in ModalFactory as follows, the error is gone.

function open(view, slide) {
    if (view && modals.views.hasOwnProperty(view)) {
        modals.views[view].show();

        if (view == 'imageView' && slide) {
            $ionicSlideBoxDelegate.$getByHandle('image-view').slide(slide);
        }
    }
};

function close(view) {
    if (view && modals.views.hasOwnProperty(view)) {
        modals.views[view].hide();
    } else {
        Object.keys(modals.views).forEach(function(key, index) {
            modals.views[key].hide();
        });
    }
};

function remove() {
    console.log('remove');

    modals.data.splice(0, modals.data.length);

    Object.keys(modals.views).forEach(function(key, index) {
        modals.views[key].remove();
    });

    modals.views.splice(0, modals.views.length);
};

modals.open = open;
modals.close = close;
modals.remove = remove;

return modals;