ng-admin - Displaying form validation errors from the server

Sorry if this is documented somewhere but I haven't been able to find it. Is there a way to specify field errors after a create/update fails validation on the server? Does ng-admin have any features to highlight the fields with errors? Should I format my error response in a specific way?

EDIT: Should mention that I've already configured error display through app.errorMessage(), just wondering if there's additional form field highlighting features.

The next version of ng-admin makes it possible usinf creation and edition hooks (refs https://github.com/marmelab/ng-admin/pull/898):

For instance, a POST /comment REST endpoint may return with an HTTP error code if the post_id pointed by the new comment doesn't exist.

POST /comment
{
    body: 'Commenting on a non-existent post',
    post_id: 123
}

HTTP 1.1 400 Bad Request
[
    { propertyPath: 'post_id', message: 'Related post does not exist' }
]

To catch these errors and display them, use the editionView.onSubmitError() and creationView.onSubmitError() hooks. They accept an angular injectable (a function listing its dependencies), and ng-admin can inject the error response, the form object, and many other useful services.

comment.editionView().onSubmitError(['error', 'form', 'progression', 'notification', function(error, form, progression, notification) {
    // mark fields based on errors from the response
    error.violations.forEach(violation => {
        if (form[violation.propertyPath]) {
            form[violation.propertyPath].$valid = false;
        }
    });
    // stop the progress bar
    progression.done();
    // add a notification
    notification.log(`Some values are invalid, see details in the form`, { addnCls: 'humane-flatty-error' });
    // cancel the default action (default error messages)
    return false;
}]);