Question

我有以下代码：

app.get('/autocompleteEmployees', function(req, res){
    var term = req.param('term');
    model.Employee.findAll().success(function(employees){
        var responseData = [];
        for(var i=0; i<employees.length; i++){
            console.log('i: ' + i);
            model.Person.find(employees[i].personID).success(function(person){
                if((person.lastName + ', ' + person.firstName).toLower().indexOf(term.toLower()) > -1){
                    responseData.push({
                        label: person.lastName + ', ' + person.firstName,
                        value: employees[i].id
                    });
                }

                if(i + 1 == employees.length){
                    res.send(JSON.stringify(repsonseData));
                }
            });
        }
    });
});

一旦调用了GET / autocompleteEmployees路由，我就会收到以下错误：

C:\Users\lowerkey\Desktop\emasc\server\controllers\Employee.js:85
                                model.Person.find(employees[i].personID).success (function(person){
                                             ^ TypeError: Object [object Object] has no method 'success'
    at [object Object].<anonymous> (C:\Users\lowerkey\Desktop\emasc\server\contr ollers\Employee.js:85:46)
    at [object Object].emit (events.js:67:17)
    at [object Object].<anonymous> (C:\Users\lowerkey\Desktop\emasc\node_modules \sequelize\lib\query-interface.js:245:17)
    at [object Object].emit (events.js:88:20)
    at [object Object].<anonymous> (C:\Users\lowerkey\Desktop\emasc\node_modules \sequelize\lib\dialects\mysql\query.js:78:10)
    at C:\Users\lowerkey\Desktop\emasc\node_modules\sequelize\lib\dialects\mysql \query.js:32:51
    at Query.<anonymous> (C:\Users\lowerkey\Desktop\emasc\node_modules\sequelize \node_modules\mysql\lib\client.js:108:11)
    at Query.emit (events.js:64:17)
    at Query._handlePacket (C:\Users\lowerkey\Desktop\emasc\node_modules\sequeli ze\node_modules\mysql\lib\query.js:51:14)
    at Client._handlePacket (C:\Users\lowerkey\Desktop\emasc\node_modules\sequel ize\node_modules\mysql\lib\client.js:312:14)

我该怎么做才能摆脱错误？

Answer 1

事实证明，人们不会简单地将for循环与异步代码混合在一起。

对于那些和我一样走路的人来说，解决办法是这样的：

    Array.prototype.foreach = function( callback ) {
  for( var k=0; k<this .length; k++ ) {
    callback( k, this[ k ] );
  }
}

app.get('/autocompletePersonEmployees', function(req, res){
    console.log('/autocompleteEmployees');

    var term = req.param('term', null);
    if(term == null){
        model.Employee.findAll().success(function(employees){
            var responseData = [];
            employees.foreach(function(i, employee){
                console.log(i + ' ' + employee.toString());
                model.Person.find(employee.personID).success(function(person){
                    responseData.push({
                        label: person.lastName + ', ' + person.firstName,
                        value: employee.id
                    });

                    if(i+1 == employees.length){
                        res.send(JSON.stringify(responseData));
                    }
                });
            });
        });
    }
    });

Answer 2

您可能会发现使用热门async库中的forEach调用更容易，而不是自己定义。

Sequelize find没有成功功能

2 个答案: