$(document).ready(function(e){
    $('.panel').on('click', '#like', function(e) {
        e.preventDefault();
        var grade = $(this).data('grade');
        var object_id = $(this).closest('.panel-heading').data('id');
        var url = 'rate/' + object_id + '/' + grade;
        $.get(url, function(data){
                    alert(grade);
                    if (grade == '-') {
                        alert('hi');
                        $(this).closest('.panel-heading').find('.total-likes').html(data)}
                    else {
                        $(this).closest('.panel-heading').find('.total-likes').html(data)}})
    });

});