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    Store.prototype.find = function(callback) {

        $.ajax({
            type: "GET",
            url: this.url ,                             // query.id
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data, status, xhr) {
                callback(null, data);
            },
            error: function (xhr, status) {
                callback(new Error("couldn't find items"));
                // callback(new Error(xhr.responseText));

            }
        });
    };