Loopback enhance, add pagination feature to the related scope object

loopback-paginate-scope

// scope object pagination method
// reference : strong-remoting/lib/remote-objects.js line 550
// reference : strong-remoting/lib/shared-method.js line 245
define('__paginate__' + scopeName, {
    isStatic: isStatic,
    http: {verb: 'get', path: '/' + pathName+'/paginate'},
    accepts: {arg: 'filter', type: 'object'},
    description: 'Pagination Queries ' + scopeName + ' of ' + this.modelName + '.',
    accessType: 'READ',
    returns: {arg: scopeName, type: [toModelName], root: true}
},function(args,cbkFromSharedMethod){
    //this will be referenced to the this.modelName's model instance
    args = args || {};
    var scopeMethod = this['__get__' + scopeName],
        countMethod = this['__count__'+scopeName],
        res = {total:0,items:[]},
        me = this;

    async.waterfall([
        //get total count
        function(callback){
            countMethod.call(me,args.where,function(err,cnt){
                if(err) return callback(err);
                callback(null,cnt);
            });    
        },
        //get paginated items
        function(total,callback){
            if(total === 0){
                return callback(null,res);    
            }    
            scopeMethod.call(me,args,function(err,items){
                if(err) return callback(err);
                res.total = total;
                res.items = items;
                callback(null,res);
            });
        }
    ],cbkFromSharedMethod);            

});