<%= f.text_field :name, required: '', 'ng-model': 'html.name', 'unique-name': '', 'ng-model-options': '{ debounce:500 }' %>

app.directive('uniqueName', function ($http, $q) {
    return {
        require: 'ngModel',
        link: function(scope, element, attrs, ngModel) {
            ngModel.$asyncValidators.unique = function (name) {
                var id = document.getElementById('id');
                var path = location.pathname;
                return $http.get(path.substr(0, path.indexOf('/', 8) + 1)+'verify?name='+name+'&id='+(id && id.value ? id.value : 0)).then(
                    function (response) {
                        return response.data.error ? $q.reject() : true;
                    }
                );
            };
        }
    };
});

def verify
    render json: Admin::Html.select(:name).where(name: params[:name]).where.not(id: params[:id]).empty? ? { success: 'Record not found.' } : { error: 'Record found.' }
end